 Heavy metal band System of a Down has also made use of the cello's rich sound.The indie rock band The Stiletto Formal are known for using a cello as a major staple of their sound, similarly, the indie rock band Canada employs two cello players in their lineup.The orch-rock group, The Polyphonic Spree, which has pioneered the use of stringed and symphonic instruments, employs the cello in very creative ways for many of their "psychedelic-esque" melodies.