Can a prompt replace YouTube Music Premium?

Build a playlist archive that outlives whichever streaming service you use, and stream your own collection beside it.

The problem this solves is real: playlists are the only thing you create on a streaming service, and they are the thing you lose. So the tool's job is to hold them as portable data.

Define one neutral playlist format: a JSON file per playlist, with an ordered list of entries carrying artist, title, album, duration, an ISRC where you can obtain one, and the source service and id it came from. ISRC is the field that makes matching across services work rather than nearly work.

Write importers for the export formats each service offers, and a matcher that resolves each entry against your local library by ISRC first, then by normalised artist and title with duration within a tolerance. Report per playlist: matched locally, matched but a different version, and missing. That third list is the honest picture of what a subscription is holding for you.

Export back out to M3U for local players and to CSV for whatever comes next.

Add a change log: re-import the same playlist later, diff it against the stored version, and record additions and removals with dates. Streaming playlists change under you — tracks are removed when licences lapse — and the diff is the only way to notice.

For playback of what you own, run Navidrome as described in the Apple Music entry.

Do not download from the platform. It breaches the terms, the tooling breaks constantly, and this build is about owning the structure of your listening rather than taking the files.