UnScramble this Word: t t c r a r e?

Questions

What singer was Bob Dylan addressing in singing: "It ain't me, babe"?

What record company threw out The Beatles after George Harrison sang The Sheik of Araby?

What was boo, maryjane and Mary Warner?

What were visible in the pictures John F Kennedy pored over on October 16, 1962?

Whose mother did Dr Hook and The Medicine Show sing about in 1972?