The same source as everyone else: DDEX
YouTube Music “playlists” and channels should always use music.youtube.com:
https://tickets.metabrainz.org/browse/MBBE-54
sigma67/ytmusicapi is probably the closest you’ll get.
That doesn’t seem to hold true. I’ve got YouTube Premium and never see videos on YouTube Music unless I manually enable it. (It also doesn’t stick, once playback advances to a track without a video I need to re-enable it)
Moreover if I switch a YouTube listing of a release to YouTube Music I’m redirected to a different “playlist” without any videos.
For example:
https://www.youtube.com/playlist?list=OLAK5uy_naFMVwrwN2NnVSKoSho8QsudSsPFuc19E
from https://www.youtube.com/channel/UCRCk-lyi0xQaoeFVBy_UDPA/releases
redirects to
https://music.youtube.com/playlist?list=OLAK5uy_nHet75VLZ4rcGDm7Adj5UwRVVszr5mh_c
which consists of art tracks only:
https://www.youtube.com/playlist?list=OLAK5uy_nHet75VLZ4rcGDm7Adj5UwRVVszr5mh_c
However in the YouTube Music interface I can enable the videos for either playlist.