<P> During their run, the group covered the transition from Disco to Punk, Electronic and Modern Romantic music . Notably, they danced to two Sex Pistols tracks . </P> <P> By late 1981, Legs & Co (by this time Anita Chellamah had replaced Peters) had become more integrated into the studio audience, rather than performing set - piece routines, as a result of the' party atmosphere' brought in by Michael Hurll . Also by this time Colby was particularly keen to work once more with male dancers; feeling it time for a change, Legs & Co's stint was ended, and a twenty - member dance troupe (ten male, ten female), named Zoo was created, with a set of performers drawn from the pool of twenty each week . Colby was now credited as "Dance Director". Three members of previous troupes, Menhenick, Corpe and Chellamah, made at least one appearance each during the Zoo period . The dancers now chose their own clothes, moving away from the synchronised appearance of previous troupes . </P> <P> By the early 1980s, record companies were offering the BBC free promotional videos, meaning dance troupes no longer fulfilled their original purpose . Zoo's run ended in 1983, and with it the use of dance troupes on Top of the Pops . </P> <P> After the demise of Zoo, the audience took a more active role, often dancing in more prominent areas such as behind performing acts on the back of the stage, and on podiums . However, in addition the show also employed so - called cheerleaders to lead the dancing . </P>

When did top of the pops start singing live