The following information was obtained from Wikipedia:
Only Boys Aloud (OBA) is a choir based in the South Wales Valleys in Wales made up of boys aged 14–19. It was set up in 2010 by choral director Tim Rhys-Evans and members of Only Men Aloud. They finished third in Britain’s Got Talent in May 2012. Besides the choral function, the choir also has a social side. They intend to give the participating boys a way to broaden their horizons, grow in ability and self-confidence and keep out of trouble.
The boys’ inaugural appearance took place at the National Eisteddfod at Ebbw Vale in 2010. Since then, they have appeared at many events, including at the Millennium Stadium, Cardiff with Dame Shirley Bassey and Catherine Zeta-Jones in the “Ryder Cup Welcome to Wales” concert. In December 2011, they joined forces with their father company, Only Men Aloud, to perform on the last night of Only Men Aloud’s arena tour at the Motorpoint Arena Cardiff and featured on their Christmas CD. They have been the subject of two TV documentaries and appeared on BBC’s Songs of Praise.