useless trivia: What Word Means: An Ulcer - A Discharge Of Fetid Matter From The Nostril?

Questions

Who had number one hits with "Call Me" & "Atomic"?

Who sang with Kiki Dee on "Don't Go Breaking My Heart"?

Who teamed up with Queen for "Under Pressure"?

Who thought it was fun to stay at the Y.M.C.A.?

Who wrote Simon & Garfunkel's "Bridge Over Troubled Water"?