Talented rappers Simon D and Block B's Zico appeared on the March 19 edition of 'Radio Star' and had individual performances that impressed the crowd.

Simon D performed "Simon Dominic 2014," grabbing attention with his charismatic stage performance and deep voice. �Zico gave off a different flavor for his own performance, also hitting more varying speeds for pretty impressive rapping as he performed Block B's "LOL."

Check out both performances below!

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