We are still early with this, but all depends of what you want to see. The term "music app" doesn't say too much from your question.

Maybe these could help you https://wavlake.com/ https://fountain.fm/ https://lightning.video/ https://www.tradebit.com/ https://peertracks.com/ - they had a good start with Bitcoin but then they turned into shitcoiners with NFTs. https://alpha.bittunes.com/

LNbits extensions that you can build directly on your website or twitch broadcast https://github.com/lnbits/lnbits-legend/tree/main/lnbits/extensions/jukebox https://github.com/lnbits/lnbits-legend/tree/main/lnbits/extensions/livestream https://github.com/lnbits/lnbits-legend/tree/main/lnbits/extensions/events https://github.com/lnbits/lnbits-legend/tree/main/lnbits/extensions/streamalerts https://github.com/lnbits/lnbits-legend/tree/main/lnbits/extensions/copilot https://github.com/lnbits/lnbits-legend/tree/main/lnbits/extensions/paywall

2bithits.com

But its kinda been stalled for now.

I had built a demo music player using LSAT-LNURL-WebLN: https://mixtape.albylabs.com/

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