RIMS CTAP DPLC

Jamendo has more than 10,000 albums by more than 5000 artists, all free for teachers to download,  use and in some cases even edit in their classroom. Each album is labeled according to its Creative Commons licensing, whether it's attribution only, non-commercial, and/or no derivatives. You can search for music according to artist, style, and/or licensing.

It may not be Top 40, but there's a LOT there in a lot of different styles!