Containing some of Zeppelin's very best tracks, "Physical Graffiti" is definitely worth the price of two discs. Like most double albums, it can get a little excessive... but if you've purchased their first 4 albums and still can't get enough, this is a must have! "Kashmir" is essential by itself and possibly the best song the group ever recorded... a majestic epic that fuses rock, blues, and middle eastern influnces... all the things Zep is known to do best! Then there's the blistering "Trampled Under Foot" which has one of Page's best riffs of all time and a funky clavinet played by the multi-talented John Paul Jones. Plant is in top form on the spiritual catharsis of "In My Time of Dying" with John Bonham providing the raw energy all the way through. Disc one is more consistent, but disc two offers a wide variety of gems such as the building ballad "Ten Years Gone" which offers some of Robert's best lyrics to date, the fun old-timey feel of "Boogie With Stu", the countrified acoustic track "Black Country Woman", and the wild "Wanton Song". Many of these tracks have the feel of b-sides (which is essentially what they were) and makes them even more fun to listen to. One of the few double LPs to truly be worth purchasing (along with the Beatles White Album, Stevie Wonder's Songs In the Key of Life, George Harrison's All Things Must Pass, and Pink Floyd's The Wall), Physical Graffiti is the high water mark of Led Zeppelin's career.