Your thinking of lnbeats.com but thats just a player. Few options
Option 1 nostr:npub1r0rs5q2gk0e3dk3nlc7gnu378ec6cnlenqp8a3cjhyzu6f8k5sgs4sq9ac has a Nostr music thing he is building that you could check out and help with building Nostr music stuff - https://nodecast.xyz/
Option 2 nostr:npub1yvgrrzf4dnmu30qfhw95x87ruu0g2kpv3a64h8hpvqsre8qeuspsgd6pv9 has https://musicsideproject.com/ that walks you through selfhosting your music. More work to set up but your in complete control.
Option 3 nostr:npub1v5ufyh4lkeslgxxcclg8f0hzazhaw7rsrhvfquxzm2fk64c72hps45n0v5 does music hosting now for $5 a month but looks like you have to schedule a demo with them to set it up - https://fountain.fm/artists
