Has he discovered punk rock yet? There's truly nothing like having a bunch of fast, loud music that speaks to exactly how you feel to listen to. And what better way to get your aggros out than screaming along at top volume to your favorite outcast anthems and diving into the mosh pit with a bunch of like-minded miscreants? Good, healthy outlet.
He's recently discovered Nirvana, Pearl Jam and Freeze-Pop (?) or is it SqueezePop. Some indie band that even you might like DFA.