The Police's power trio line-up of Copeland, Sting, and Summers performed for the first time on 18 August 1977 at Rebecca's club in Birmingham in the West Midlands. A trio was unusual for the time, and this line-up endured for the rest of the band's history. Few punk bands were three-pieces, while contemporary bands pursuing progressive rock, symphonic rock and other sound trends usually expanded their line-ups with support players. The musical background of all three players may have made them suspect to punk purists, with music critic Christopher Gable stating,