My Music does not create, store, or manage any user accounts.
The app operates entirely on your device and does not require sign-in with Google, or any other third-party service.
Since there are no user accounts, no external data deletion or account removal is necessary.
All app data such as playlists, preferences, equalizer settings, and cache are stored locally on your device.
You can delete all of this data at any time by:
Uninstalling the app, or
Going to Settings → Apps → Musyra → Storage → Clear Data
After uninstalling or clearing data, no information is retained anywhere.