Stop the Music app from launching
As long as the Music Decoy app is running, the system Music app won't launch when you accidentally press ▶ Play .
The app does absolutely no work in the background. It works by simply existing as a running process, thanks to having the same bundle identifier as the Music app.
How it works?
By having the bundle identifier com.apple.Music, the app makes the system think that the Music app is already running.