Google says I need a privacy policy since I use the READ_PHONE_STATE permission.

This permission is used exclusively for pausing playback when a phone call is received. No data is stored. Accepting the permission on Marshmallow and above is entirely optional and does not affect app usability beyond the fact that Timidity won't be muted upon an incoming call.

Here is the entire usage of READ_PHONE_STATE (lines 124 through 140): https://github.com/xperia64/timidity-ae/blob/3.0-sox/src/com/xperia64/timidityae/MusicService.java#L124

At some point I may switch to audio focus and do it properly, but I don't really trust it enough at this time.