Due to schedule conflicts with a pro baseball game that ran late last week,�'Music Core' was forced to cancel its broadcast. However, they continued to film performances and decided to air those for today's episode instead. Consequently, hip hop group M.I.B made their 'Music Core' debut this week�with their title track, "G.D.M." Showing none of the nervousness that usually plagues rookies on their debut stage, the boys rocked a confident look with their energetic stage. Their witty lyrics also caught the attention of viewers, with some lines stating, "I'm a beast just out of the jungle / I'm a gentleman on the outside but from Mensa when it comes to hitting on ladies." Their live rapping made the audience question whether it was truly live due to its flawless quality. Check out their debut below!