I bow to thee...

1. A is a American southern rock band. It was pretty famous and visible worldwide before several members of the band were killed in a plane crash in 1977. The band's name is a mocking tribute to the gym teacher of the vocalist's school who enforced a rule in school against boy's long hairs. Id A.....
2. Most of the music of song 'B' was written by X while the lyrics came from Y's experience when he was injected tranquilizers for hepatitis by a doctor before a band show. X and Y disagreed about how to record the song, finally deciding after much fighting on Y's opening and X's ending on solos to give a memorable track. Giveaway (literally).. B, X, Y.