Bang!

"Bang!" is a song recorded by South Korean girl group After School. This song marked the first appearance of the group's eighth member, Lizzy. It was later released in Japanese for the group's Japan debut. The song was released on August 17, 2011, in 3 editions. The Japanese version does not include former member Bekah, who left the group after promotions for the group's first Korean album Virgin were finished to become a designer. Background "Bang!" is After School's third Korean single. The title track, which was used as the lead single, was originally planned to be included in After School's second single "Because of You," but was delayed due to the lyricist and composer wanting to make the track more complete. The single's concept displayed the group wearing sexy marching band outfits, and it was later revealed that Kahi created the concept. Kahi stated that after watching the American film Drumline, she fell in love with the marching band style and wanted to do a marching band concept since becoming an After School member. The group practiced playing the drums for five months with a trainer for the concept. The title track reached #17 on the Gaon 2010 digital download charts with 2,374,731 copies sold. More than one year later, the single was released as their official Japanese debut. The single was released in three versions, two CD+DVD editions and one CD only edition. Both CD+DVD editions include the same track list, however the A edition features contents in Japanese, while they are in Korean for the B edition. The CD only edition also includes the original Korean version of the song, plus two instrumental tracks.