Gimme me a break. Chaim is right when he says that Jews shouldn't imitate black culture but he is dead-wrong about Matisyahu.
Matisyahu blends rap and reggae with rock and a capella. It is true that rap and reggae are black noise but rock is American and a capella is Italian. In Judaism, a capella is called 'Sefirah' and it is usually performed while celebrating the Sabbath, in the absence of musical instruments.
Personally, I've met Matisyahu and he is a soft-spoken, kind-hearted person. His concerts on college campuses are filled with religious Jews and secular Jews (like myself), who would otherwise have very little to do with Judaism. If he inspires one Jew to take more interest in Judaism, he will be blessed by Hashem.
He is not a Woody Allen type Jew or an Ehud Olmert type Jew, the ones we are so critical of. He is a real Jew, whose talents in music should be commended by JTF.