Their first single was "Crash", a song with a strong guitar and drum accompaniment. The music video was very dark, showing the members destroying various objects such as T.V.s, cars, etc. as opposed to "Crash", which was a melodious dance tune combined with hardcore guitar and staccato drum beats, their other song, "Icarus", was a ballad, showing their smooth vocals and harmonizing skills. Many of the fans also mention that "Icarus" sounds a lot like Shinhwa's number one hit song, "Once in a Lifetime". "Flying Up", the third track from the single, was a rap song with great beat. Their debut performance was on SBS Gayo where they received very little applause and cheers though it being their first performance they achieved very well. From then on when they first did their live performance critics all stated that Battle is weak in vocal skills, despite the rolling rumors and comments Battle went on MBC Music Core and did a live performance for the very first time and performed very strongly.