If you’re interested in music and video from the past, the following links may be of interest to you.
Discogs – If you’re looking for something on vinyl or CD, this is the place to go. One of the best resources for commercially released music.
Disco! A fun page focusing on disco from the 1970s. Be sure to check out their Top 700 list.
The Second Disc This is a formidable page with tons of information on new and past releases. Sign up to their mailing list and get up-to-the-minute information about new releases and re-issues.