Today in Rock History: May 9th
1970: The Guess Who hit the top spot on Billboard's Hot 100 with "American Woman". The song was born by accident when guitarist Randy Bachman was playing a heavy riff on stage after he had broken a string and the band had taken a break. The other members joined in on the jam and Burton Cummings started singing the first thing that came into his head. A fan in the audience had it all on tape and presented it to the group after the show. It was quickly developed into a full song in the studio and ended up spending 3 weeks at the top of the US singles chart. It made #19 in the UK.