Top of the Pops (UK) Season 28 Episode 42

No miming: Due to the general ridicule of the show for allowing stars to mime their performances, Top of the Pops' producers decided to insist all stars sing live, however, due to technical reasons, still insisted the music should be a pre-recorded backing track. The rule didn't last long however as many stars embarrassed themselves with their poor abilities to sing live and some band's even ridiculed the rule, notably the all-time classic performance of Nirvana 'Smell's Like Teen Spirit' where Kurt Cobain performed his vocals an octave lower and the band over-exaggerated their mimed instrument playing.