Generic Music Archive and shopping at Amazon.com

[my_name_is_link]

I think that VGMdb is a fabolous info-provider for videogame music. I'd like to know about a similar archive/community for every type of music, where I can find infos about authors, albums, the release date, how many releases existing, and so on: do you know any?

By the way, do some of you shop at Amazon.com?
How it works? The sellers send items to Amazon and Amazon send them to me? Also, I've heard that Amazon can store items for you for a time, to let you continue shopping and save money on deliver costs: is it true?