ITunes won't let me listen to my music?

Ok so about a year back my brother got me to sync his ipod to my iTunes and a message popped up asking if i wanted to take his purchases so of course i said yes so i got all the music he brought and i still had all the music i brought but last night i was sitting on my iPhone and i went to play some of his music and it started kinda glitching out and alot of his music it won't play and says no content but i can still listen to my music? Next to the music of his i can't play it had the little paused sign next to it, i'm so confused and just want to fix it.

Download iMesh, it has all the songs, they're all free, it's legal and it doesn't glitch.

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