The first thing that pops into my head is using a list to push notes of liked/zapped tracks listened to on wavlake. Posting stuff you listen to seems to be a popular thing to do, so why not set up a list to automate that? Eventually, I'd like to have nostr keys integrated into a fork of nextcloud so that you can have a list control what nyms are allowed to access files without needing to have anyone sign in or deal with password nonsense. Heck, if there's ever a hardware nostr signer, you could use that as a controlled access door lock.

Does wavlake support lists? People could just follow you by putting you into one for their lists. Then they don't need to see your posts, just see what you are listening to. Either way, the list should be theirs, not yours. You can already use the current lists we have to manage access controls. That is easy. You just need to code the control itself (check if the key is in the list before downloading). I think Blossom has a version of that already.