Founded in 1972, Music Disc has exchanged its storefront on Hampden Avenue for a warehouse space at 3895A Newport Street in Denver; 45s are available for browsing by appointment, but the rest of the stock isn't. Fortunately, though, the entire library is accessible on the Web -- and what a library it is. The site has a huge collection of rare and hard-to-find albums, singles and so on. The prices ain't always cheap, but if the one thing that would make your life complete would be finding a copy of Captain Beefheart's "Ice Cream for Crow" on 45, it's worth it.