mike,
You can contact Cloud Support here:
https://www.amazon.com/gp/help/contact-us/cloud-drive.html?nodeId=200557340

Or if you need mp3 Support, you can contact them here:
http://www.amazon.com/gp/help/browse-form-dispatch/dispatch.html/?nodeId=200197240

Thanks for confirming that Cloud Player is pretty useless to anyone with a music collection of any size. We need to be able to sync our music, while also detecting changes -- say I go through and update my mp3 tags on my PC and want to reupload them so I can find them in Cloud Player. Google Music has the same issue.

yes, i agree that the cloud player is useless. all of my music is on ITunes and what I have on my Kindle Fire is what Amazon allows me to store for free. Many duplicates; sometimes when I have nothing to do, i'll delete them from my Kindle Fire.

I think anyone who has used this service has encountered this problem. A cynic might suggest it is not in Amazon's interest to fix this as they would sell less data and would lose bragging rights for the amount of data stored, after all, as has been pointed out, most other services seem to be able to deal with this. I will also be cancelling my Cloud account and asking for a refund. Probably send back my wife's new Kindle Fire HD too as the whole point was for her to be able to acess her music and photos. Will try google play and a nexus.

I too have over 30,000 songs in my Cloud Player in theory, but many thousands of them are duplicates. Many of them, ridiculously, are songs originally purchased from Amazon which I downloaded to my iTunes Library, and which Amazon has now copied and re-uploaded multiple times. To not provide a simple tool for finding and deleting duplicate tracks makes this service more useless by the day for anything except backup.

The lack of management tools for larger libraries, to me, indicates that Amazon is not really serious about this service. So, OK, there are other choices.

Just as the (?) Hundreds of people before me, I have an "unholy" amount of Duplicates. I agree that the Software Engineers must be listening to SiriusXM or something, because queuing up an album and listening to the same songs each - 3 or four times is ridiculous.
What amazes me, is if you look at this thread - it has been going on for OVER A YEAR!!! Unimaginable! If MS Outlook (which I hate) can make a "mass duplicate removable tool", are you telling me Amazon can't come up with anything? Perhaps their impression is that we all just sit around and enjoy listening to multiple copies of each song. My time is worth something - at least to me. Spend the time weeding through the garden? I don't think so. I'd rather delete them all and find some alternative.
Over a year.... incredible!

I've always used the Amazon MP3 uploader and it has always created duplicates, so that's not the solution.

Dirk

If you update the tag info on your song file chances are the downloader reads this as being a completely new and different copy or version of the song. I just re-ripped my entire Led Zep library at a much higher bit rate and should have deleted the old versions from Amazon before re-syncing library with the new versions. Now I can't tell the difference and have no way to know which cloud copy has the highest bit rate, if it was matched by Amazon, or if it was uploaded from me. I want to be sure the one I delete online has the lowest bitrate. (obviously I know that if it was matched it will have 256kbps regardless).

The Upload process is much slower than iTunes Match upload.

I uploaded 2500+ songs to Google Play in a couple of days this last week. It took Amazon over a month of start, stop, freeze, start, freeze etc to get that many songs uploaded and I PAYED for the privilege! Give it a try, it's FREE. I may try iTunes as well, as I'm sure the organizational issues will be far fewer.

And now we are into 2013 with no solution. For a problem back in 2011...

I am in the same boat with the duplicates in the cloud player! Just uploaded 30k songs (which takes way too long) and it looks like I have thousands of duplicates. I used the MP3 uploaded and it did not help the situation at all!

I've been doing some testing to try to identify the circumstances where duplicates can occur.
Obviously with Amazon purchased files the duplication has occurred outside of the uploader process.

I have uploaded a song, changed the physical file path (eg. c:\temp\01_somesong.mp3 changed to c:\temptemptemp\01_somesong.mp3) and the uploader identifies it as the same song and will not re-upload it.
I have uploaded a song, changed the physical file name (eg. 01_somesong.mp3 changed to 01_somesong_artist.mp3) and the uploader identifies it as the same song and will not re-upload it.
I have uploaded a song, changed the MP3 tag Title and the uploader identifies it as a new song and re-uploads it.
...changed the MP3 tag Genre and the uploader identifies it as the same song and will not re-upload it.
...changed the MP3 tag Artist and the uploader identifies it as the same song and will not re-upload it.
...changed the MP3 tag Album and the uploader identifies it as the same song and will not re-upload it.

I did not run these tests through multiple times, so it's possible behavior might be intermittent and not predictable - but at least now I know to expect duplicates if I modify the Title tag.

I spoke with an Amazon MP3 Specialist and she indicated that pausing or canceling the upload can be problematic and lead to duplicates.

If anyone has identified any other known behaviors which result in duplicates, please post so I can avoid them :)

Also, I've gone looking for alternative services and so far there really aren't any to support a large collection.
iTunes is up to 25k - https://discussions.apple.com/thread/3579741
Google Play is 20k - http://support.google.com/googleplay/bin/answer.py?hl=en&answer=1143668

Only with Amazon can I have access to my entire collection from the web - as far as I am aware - so I am trying to make the best of it.

Good work. My view is that one shouldn't upload a library until you are sure it is itself free of duplicates and you can be sure your mp3 tagging is sound. Further I'd say a fast reliable connection is recommended and DO NOT ATTEMPT to upload a large library in one go.
What I want to know now is how do I 'one click' delete the whole library so I can start again!

Every time I've asked that, I've gotten the "please call us" response.

That's a great point of view ... if you have a static collection of music. Just wait until you're all done, then upload the whole thing. My collection is constantly changing, or to be more specific GROWING. And I do have everything in my collection correctly tagged with the appropriate covers. My MP3s are all 320 (and yes, with my sound system I can really tell), but my best stuff is in FLAC (and yes, with my system I can really tell). This all gets dumbed down to 256 MP3.
The benefit is that I have it backed up for $20/year. I've been collecting music for 45 years, so when I see people with collections of 20,000 or 30,000 tunes I really appreciate the unlimited back up I have with Amazon while I constantly trim my favorites on Google. Of course, as we age the little tiny hairs that pick up the quiet tones, the ultra highs and the overtones go away. By the time I'm 70 (only 15 years away) I may not be able to tell any more.

Yes, the little hairs do seem to diminish in function with age. There is one possible advantage of using Amazon's cloud service that does not get discussed. Suppose you have a piece of music that is flawed--the vinyl skipped, there was a lot of hiss or something that cannot be properly filtered out, or the file got some kind of corruption, or your only source is something like an old, low quality cassette, which, even at its best when new, had zilch for quality. All you have to do is convert it to lower quality, upload it, and, obligingly, Amazon will supposedly replace it with a better copy, which, although not at the quality level you prefer, is, nonetheless, without those flaws. The problem you might have, though, is that sometimes there exist numerous versions of a particular recording, particularly with pop music, which may vary only slightly--slightly different mixes, re-recordings, etc., and I'm not sure whether you would get the version you want.

Interesting you should bring that up. I checked a CD out of the library last week "Latin Jazz - Ritmo de la Noche". Tried ripping it with Exact Audio Copy (which, if you're not using, you should be http://www.exactaudiocopy.de/en/index.php/resources/download/ ) and could not get tracks 10, 11 and 12. Too many errors. So I used one of my crappo rippers (iTunes, WMP or WinAmp). Of course, it ripped the errors right into the track. Amazon matched them up just fine. So now I have most of Ritmo de la Noche in perfect FLAC and 10,11 and 12 in 256 MP3. It is better than nothing!

Another consideration is that with Spotify at $9.99/month I a nice 320 Vorbis (better than MP3) wrapped up in a pretty little Ogg package. Set your default input to your sound card (Audacity) while streaming and and then you have your own little portable copy. Those I do save as 320 MP3. FLAC is better than Vorbis, but the Vorbis isn't so great it justifies the other bits.

And then, with Spotify at $9.99/month offering me anything I've asked for (Karajan conducting Mozart, Lee Ritenour Six String Theory) why do I still bother to keep a library? Paranoia and old age I guess. I still listen to my FLAC more than Spotify and my children love my Amazon clould.

I doubt that it would ever be a problem, but I'm not sure it's a good idea to be admitting in a publicly accessible forum like this that one had ever made a copy of something that one did not individually own, although I do see a potential mitigating technicality that I wonder about. A person who is one of we, the people, that form a particular governmental entity, might be considered, technically, to be a part owner of a public library's entire collection--if one is a resident of whichever governmental entity runs that library. Conceivably, then, that could give one the right to make a personal back-up of anything in its collection. I am not an attorney, and this might be a ludicrous idea to someone versed in law, or there might already be an exception in present law denying that argument as an affirmative defense....I've been using dB Poweramp for more than ten years, and have found its options to be sufficient, including its attempted error correction: http://www.dbpoweramp.com/secure-ripper.htm.

I have the problem with multiple downloading. I got disconnected from the internet while downloading from the Cloud to my laptop. It doesn't tell me what got downloaded and what didn't so I just restarted the download process. You would think it would skip the songs that are downloaded on my PC but now, it downloads them a second time and adds a (1) after, creating duplicates on my hard drive and in iTunes!! There has to be a better way than sitting for hours checking what songs were downloaded onto a device and what is on CloudPlayer and then going and individually checking the files that need to be downloaded. Sorry but Amazon MP3 Downloader is a STUPID app. I just hope that the downloading of duplicates doesn't count in my 10.

Another new month. Another post confirming there's no fix.

On the bright side, Winamp has launched a beta for their cloud service. It seems to be 5GiB free, but I saw mention of 100GiB when I started the account, so I'm sure there'll be better options once fully launched. Just install the latest beta, click "Cloud" in the library and sign up for the waiting list with Facebook.

Because Amazon sure hasn't seen fit to fix this issue.

This is ridiculous. I cannot believe that there's no solution for this yet! I have 10,000 songs in my library (not quite as many as some of you), but it's taking me HOURS to go through and delete all of the dupes. Amazon, PLEASE find a solution to this!

I just gave up. Cancelled my Premium membership. Absolutely ridiculous. I can't even navigate my collection anymore.

Yes, where is the fix??????

There is no fix. Same thing happens on the iTunes Cloud. I had to manually tell each duplicate to hide in the Cloud.

With a bil-zillion apps and as fast as tech moves, its a shame no one can make one for duplicates