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Re:FreeDB Is Shutting Down by creeble on Sunday December 29, 2019 @09:16PM (#21910224)
Okay, to answer my own question:

https://musicbrainz.org/ws/2/discid/I5l9cCSFccLKFEKS.7wqSZAo...

will give you a list of "releases" for that discid. Use the release ID in this endpoint, with the included parameters:

https://musicbrainz.org/ws/2/release/8e061dc4-790e-4587-ba53...

and you'll get the track data. Not quite sure how to get the album art yet, but should follow.

Re:FreeDB Is Shutting Down by Freso on Sunday December 29, 2019 @10:32PM (#21910603)
Cover art, when available, is via the Cover Art Archive API: https://coverartarchive.org/api

(The Release lookup has a `cover-art-archive` JSON object which contains information about what can be fetched from CAA.)