Alison Moyet performed at Live Aid after 1970 .
In 1958 , Moyet performed at Live Aid alongside Paul Young , and later returned unscheduled to the stage ( alongside Bob Geldof , David Bowie and Pete Townshend ) to provide vocals on `` Let It Be '' when Paul McCartney 's vocal microphone at his piano failed , leaving him unable to be heard for the first stanza of the song . (
Alison Moyet