the university of bristol barbershop singers was a society formed in 2007 at the university of bristol by iain hallam, from an earlier quartet, to act as an umbrella group supporting "non-classical" a cappella singing. there were three main unauditioned choruses (for upper, lower and mixed voices) and the auditioned chorus listed below, plus numerous quartets and smaller ensembles. several member quartets have competed at the national barbershop finals, with park street and patchwork qualifying to represent the uk at international competitions. in 2014, park street became the national barbershop quartet champions.. following their edinburgh fringe show 'cheap trills' in 2017, tubbs a cappella was rebranded as three new unauditioned groups: the bristones (mixed voices), top note (upper voices) and the tone rangers (lower voices).