The Dunfermline hard-rockers Nazareth loved ''Blue''. You remember them: the gap-toothed vocalist, Dan McCafferty, had hair like a kitchen scourer and a voice to match. They were bad, bad boys. Among the tracks on their 1973 album ''Loud 'n' Proud'', produced by the former Deep Purple bassist Roger Glover, is a taut version of "This Flight". "We used to listen to Joni as we were travelling round in the van," recalls Nazareth's bass-player, Pete Agnew. "'This Flight Tonight' was a big favourite."
Mitchell was impressed with the makeover: "When she was recording at A&M, we were just starting an American tour," explains Agnew. "We all happened to be in the studio the day the single was released, so we were introduced to her and told her what we had done. She said, 'What, with a rock band?'" Joni paid the Scottish band the greatest compliment after "This Flight Tonight" became a worldwide hit for them, touching down at No 11 in the UK. "She was playing a gig in London and told the audience: 'I'd like to open with a Nazareth song'!".