useless trivia: What Word Means: Reverse Sides - Supports - Moves Backwards?

Questions

"Leaving On A Jet Plane" was recorded by Peter Paul & Mary, but written by him?

Kinda I Want To, Sin, The Only Time?

Mick Jagger's solo album which has covers of James Brown and Bill Withers?

Styx song, "I thought that they were angels, but much to my suprise.."?

Sub-culture, Sooner Than You Think, Face Up?