Rabbi, Justin--
I took a few minutes to learn a little and sample the Matisyahu stuff.
Obvious Bob Marley, Phish and Grateful Dead influences, all applied to a dancehall reggae approach.
Really nice. If you like him, AND it actually comes close enough to count as "rap" for the purposes of this thread, then you'd like Shabba Ranks, and Mark Mohr (Christafari).
Mark is not a native Rasta/Jamaican, but has made it his life's work to delve deeply into ALL forms of Reggae (and there are several), and really kicks it in each of the Reggae sub-genres.
In addition to my affinity for '70's funk, I really like reggae as well.
Just not what is usually considered rap.