1. Their hits included "Waterfalls," "No Scrubs" and "Unpretty": TLC
2. Donald Fagen hit subtitled (What A Beautiful World); "I.G.Y."
3. Harry Chapin hit about a morning radio disk jockey: "WOLD"
4. A Michael Jackson hit from "Thriller": "P.Y.T. (Pretty Young Thing)"
5. British rave group who hit with "3 A.M. Eternal" in 1991: The KLF
6. They came "Straight Outta Compton" in 1988: N.W.A.
7. Their hit was "Da'Butt" from Spike Lee's movie "School Daze": E.U.
8. A creepy 1970 hit by Bloodrock about a plane crash: "D.O.A."
9. The Sunshine Band's piano player: KC
10. The band who remade the Sunshine Band's "Please Don't Go" in 1992: K.W.S.
11. You down with this?: "O.P.P"
12. A Rush favorite named after the tag abbreviation for the Toronto airport: "YYZ"
13. Ronny and the Daytonas' 1964 car song: "G.T.O."
14. According to the Village People, it's fun to stay here: "Y.M.C.A."
15. A track from Cream's "Disraeli Gears" album: "SWLABR"
16. Initials used by an Abba hit and the "Take Your Time" band: S.O.S.
17. It's "easy as 1-2-3, as simple as Do-Re-Mi": "ABC"

Bonus: This 1974 Number One hit used initials in both its title and artist: "TSOP" by MFSB