Add Yahoo as a preferred source to see more of our stories on Google. Sometimes, the unintentional songs become the most famous, with a 1971 hit by Rod Stewart having initially been a throwaway track.

Released briefly on Windsong in the mid-'90s before going out of print and commanding large sums on eBay, the BBC recording of Soft Machine's March 11, 1971 Paris Theatre show in London, England was a ...