I know really nothing about these and think I'm gonna start collecting them. Thus far my crown jewel is a Penny Lane/Strawberry Fields promo w the trumpet at the end. What are the coolest and rarest 45's to collect? I just picked up Help! because of it's distinction of being a different vocal. Not really rare or valuable but I just wanted it. I kinda just started by trying to get all the recordings on Rarities. Anyone want to espouse their knowledge of collecting 7"? Tips, pointers, cautionary tales, anything at all. I'm all ears.