Shortly after Diablo II's release, Blizzard began posting MP3s of the week, with notes by the composer Matt Uelmen. Those posts are all archived below.

The full soundtrack used to be available for free on Blizzard's webbsite, but those links are now long dead. The outtakes can now be downloaded from Archive.org:

The rest of the soundtrack used to be available here as well, if you manage to get a hold of them please push them to Archive.org and add the link here.