Progress on the lock down project. Place an old cassette tape on top of the box to listen to a Spotify playlist. Lift the cassette to pause playback, replace to continue. Switch the (cassette) tape to change the playlist.
An RFID tag on the tape triggers a reader in the box. The ID on the tag maps to a playlist which a Raspberry Pi plays via Mopidy through a Denon amp and Q-Acoustic speakers.
Well, what else was there to do?