Several tracks in "development" were produced and recorded in 2011 before the official debut of EXO in the entertainment industry, but he never did in his first EP "MAMA". Some of these tracks were included on album "XOXO", including "Black Pearl" and "My Lady". In July of 2013, a repackaged version of "XOXO", was renowned as a "으르렁" ("Growl") was developed with three tracks additional. Composed by Hyuk Shin (Joombas), DK, Jordan Kyle, John Major, and Jarah Gibson, "Growl" is dance-pop genre with R&B and funk. The single was leaked prematurely online July 27, when a video of the group practiced for the Korean version of the song was uploaded to several sites