First 45 I bought I think I can still remember> "Brandy (You're a Fine Girl)" Looking Glass. My granny had bought us the first Beatles album. And my dad was into big band so I listened to a lot of that, especially Three Little Fishes.
My parents were into theater (they were off and on president/vice president of the local Children's Theater) and had the original Jesus Christ Superstar album. Wish I still had that. Still love the album.
First LP was "Made In Japan" Deep Purple. Hmm, maybe I had an Ian Gillan obsession?
Next was Sly and the Family Stone's "Fresh".
Grand Funk's "We're an American Band" was up there too.