Discogs

Discogs is a website combining a crowd-sourced database of music releases with a marketplace for buying and selling records, CDs, and other physical formats. It is used by collectors and listeners to catalog recordings and to trade with other sellers, reaching an audience focused on music.

Entries include pressing details, track listings, and cover art, contributed and edited by members of the site's community, alongside a marketplace where individual sellers list items for sale to collectors.

Its ads.txt file lists 33 authorized ad systems, with 31 direct and 8 reseller entries.