Not sure what happened, but my music app is now different and my music does not sync with the music on my desktop. I am not happy about this? How do I fix it?
You don't say what Android device you own.
I am assuming you mean "Google Play Music" which is on android devices and tablets.
you can set up sync from the device or from the Google Music web site.
Download & install Music Manager - Google Play Help
https://music.google.com
You probably received an update to your device and need to reset some features and functions.
Good Luck