1. AOL Music (28,634,778)
2. MySpace Music (27,423,200)Generic_headphone_computer
3. Yahoo Music (20,578,092)
4. MTV Networks Music (18,543,442)
5. ArtistDirect Network (12,193,996)
6. MSN Music (7,352,016)
7. Jango Music Network (6,921,809)
8. Universal Music Group (6,240,440)
9. Imeem (6,162,165)
10. Project Playlist (6,043,186)
11. Rhapsody (6,014,385)
12. Sony Music (3,900,618)
13. Lyricsmode (3,804,775)
14. Last.fm (3,740,479)
15. Windows Music (3,054,952)

This information gathered by Comscore Media Metrix shows the most popular music sites visited in April.