Initially acts performing on the show mimed to the commercially released record, but in 1966 after discussions with the Musicians' Union, miming was banned. After a few weeks during which some bands' attempts to play as well as on their records were somewhat lacking, a compromise was reached whereby a specially recorded backing track was permitted, as long as all the musicians on the track were present in the studio. As a result, Stewart hired Johnny Pearson to conduct an in-studio orchestra to provide musical backing on select performances, beginning with the 4 August 1966 edition. Later, vocal group The Ladybirds began providing vocal backing with the orchestra.