Zwan was an American alternative rock supergroup formed in 2001 by lead guitarist/vocalist Billy Corgan and drummer Jimmy Chamberlin. Other members included bassist Paz Lenchantin, plus guitarists David Pajo (Slint) and Matt Sweeney (Chavez). The band released only one album, Mary Star of the Sea (2003), before breaking up acrimoniously that year during their world tour to promote the album.