After rocking out at their stellar showcase and teasing fans like crazy, the indie quartet CNBLUE has finally made their debut on today's Music Bank! With their rich, upbeat sounds and their sharp mastery of their individual instruments, the boys of the group did not disappoint anyone with their debut. They performed their debut single I'm a Loner and got the crowd grooving to something other than auto-tune. Variety is always a good thing in a music scene that is quickly becoming flooded with trite lyrics and sounds. Plus, you've gotta love hot eye candy with instruments. Check out their debut performance below!