In 1991 the producers of the show allowed artists the option of singing live over a backing track. Miming has resulted in a number of notable moments. In 1991 Nirvana refused to mime to the pre-recorded backing track of "Smells Like Teen Spirit" with Kurt Cobain singing in a deliberately low voice and altering lyrics in the song. In 1995, the Gallagher brothers of Oasis switched places while performing "Roll with It". During their performance of "Don't Leave Me This Way" the Communards singers Jimmy Somerville and Sarah Jane Morris swapped lyrics for part of the song towards the end. Another example of whimsy was John Peel's appearance as the mandolin soloist for Rod Stewart on "Maggie May". The new practice also exposed a number of poor live singers, and was dropped as a general rule.