If you're focus is nostr, and I know that's where your heart is, the Wavlake api may be a better choice for you because of the way they handle the value block. Because nostr doesn't do splits very well, non-Wavlake feeds may be problematic for you. However, if you're interested in other non-Wavlake music, the Podcast Index also has an API that lets you fetch all of the music feeds, but the value blocks are considerably more difficult to do using nostr based wallets. Hopefully, nostr figures out an elegant way to handle splits, because it is really cool being able to have multiple people paid from the listener.