Answer the following question: Information: - Concerto for Constantine is an unsigned Irish indie rock band formed in August 2007. The band consists of former JJ72 frontman Mark Greaney (vocals, guitar), former Turn and Idlewild bassist Gavin Fox (bass) and former The Frames and Bell X1 drummer Paul 'Binzer' Brennan (drums). - Vega4 was a four-piece alternative rock band formed in London. Johnny McDaid was the band's lead vocalist and songwriter, joined on guitar by Bruce Gainsford. Gavin Fox was the band's bassist and Bryan McLellan the drummer. - Gavin Bernard Fox is bass player with the band Concerto for Constantine . Born in Dublin , Ireland , he has also been in the band Vega4 , Scottish rock band Idlewild , and Irish indie rock band Turn . He now plays in Little Matador . Given the information, choose the subject and object entities that have the relation of 'instrument'.
Answer:
gavin fox , guitar