Discogs is a user-built database containing information on artists, labels, and their recordings. Discogs also incorporates a Marketplace where you can buy and sell the recordings. Discogs is constantly growing as users submit releases to the database.
A collector's guide to jazz music CDs/DVDs, AACs/MP3s and vinyl records (LPs/EPs/45s/78s, etc.): Blue Note, Prestige, Riverside Records (the big three labels of modern jazz); bebop, cool/west coast, hard bop, modal/mode, free/avant-garde jazz musicians; Miles Davis' personal connections, and more.