Is it a crime if a person is playing music on the top of his roof loud enough for kids in the school across the road to hear it?

yes there are several charges he can get from the police ,disordley house and noise pollution,distrubing the piece, just for a few i would ask him to turn it down it he don't i would goto to the police and sign a complaint and ask them to goto his resdince and ask him to turn it down.