How to find my synced mp3 on my iphone
Open up Settings on your iPhone
Select "iTunes &amp; App Store"
Tap the switch beside Music under "SHOW ALL" near the top


You should now only see the music that has been synced to your iPhone. The other music that could be potentially downloaded won't appear.

If you want it to list the rest of your library again, you just need to go back into the Settings and turn that option back on.