useless trivia: What Word Means: To Undo A Zipper?

Questions

Jazz Saxophonist well-known for playing "Girl from Ipanema"??

John Cougar Mellencamp song, sings the title then says "But ain't they all?"?

Name of Elvis Costello's back-up group??

Name the band in which Nick Cave's lead guitarist, Blixa Bargeld sings??

Ian McCulloch, Les Pattinson, Will Sergeant, Pete de Freitas.?