If you're not familiar with these artists, this is a great introduction.
For those that are, you know they are some of the best in their genre's.
The first song "Bewitched, Bothered, and Bewildered" makes you feel like you are sitting in a smoky piano bar smack-dab in the middle of a black and white movie. The sexy, suggestive lyrics must have been a little racy in their day!
The second and fourth songs are a breezy, jazzy Latin style. The Brazilian vocalist Astrud Gilberto is best known for singing "The Girl From Impanema".
Charlie Parker's jazz saxophone, is featured in the instrumental "Loverman".
The 6th track has Sarah Vaughn scatting in "Lullaby of Birdland".
"What a Diff'rence a Day Makes" won Dinah Washington a Grammy for "Best R&B Performance" in 1959 (I found this in Wikipedia), and was her first top ten "pop" (instead of R&B') hit, and in 1998 was inducted into "The Grammy Hall of Fame" for "Traditional Pop Single".
I give this sampler 4.5 out of 5 stars because I'm not too crazy about the Sarah Vaughn choice.
All in all, it's very enjoyable to listen to.