Emerging from 19th century, dance music ensembles playing imported American popular music, dance bands sustained and defined the musical mainstream in 20th century British popular culture. Professionally engaged in social dance venues during WW1, they evolved as key elements in variety, theatre, radio and television. What became known as the ‘golden age’ (1920-1940) saw them performing in London hotels and clubs, on BBC broadcasts and on records. Band leaders were household names; their musicians entertained people all over the country (especially at the seaside) often involving non-professional musicians. Substantial original research and numerous recordings will illustrate and explore this golden age.