He does good music but according to his Wiki page, he sometimes performs with a Muslim rapper.
Listen to the songs, listen to the words, this man writes beautiful authentic Jewish lyrics.
Do you know which 'muslim' rappers he raps with? This man is very Zionistic and supports Israel, has performed there many times, and I believe he moved there.
I looked at the wikipage... It appears the man you refered to is Kenny Muhammed who is respected as one of the best beatboxers in the business.