Why did my music dissappear

Yesterday I listened to my music with no problems, but today when I was connecting to a new bluetooth speaker it kept saying the music files were not supported. At first I thought it was the speaker that was having the issue so I disconnected the speaker. Even after that the files would not play. I restarted my phone and now none of them are on my phone! I also should let you know I down loaded all 300 ish songs from an app. If that makes a difference, and have a Samsung Galaxy S5. Please help me, and thank you in advance!

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