The guitarist admits the band were at a "low ebb" in 1972 � and they'd already decided to call it a day when they got the call asking them to consider recording the song.

Ralphs tells Nicky Horne on TeamRock Radio's Classic Rock Magazine Show: "We were in Switzerland towards the end of an unrewarding and disappointing European tour. We ended up in this club that was a converted gas tank, apparently.

"We said, 'Is this really all there is to our lives? This is pretty sad. We don't seem to be getting to where we wanted to get � why don't we go home and do something else?'