The Smashing Pumpkins are an American alternative rock band formed in Chicago in 1988 by frontman and guitarist Billy Corgan, guitarist James Iha, bassist D'arcy Wretzky and drummer Jimmy Chamberlin. The band has undergone several line-up changes since their reunion in 2006, with Corgan being the primary songwriter and sole constant member since its inception. The current lineup consists of Corgan, Iha, and Chamberlin. The band is known for its diverse, densely layered sound, which evolved throughout their career and has integrated elements of gothic rock, heavy metal, grunge, psychedelic rock, progressive rock, shoegaze, dream pop, and electronica.