The number one song on the Billboard Top Singles chart on May 12 1970 was by The Guess Who.
This is the album version of American Woman which I played at KZOK in the mid ’70s (and later in the mid ’90s at KJR-FM). The single version was giant when I was at KJR-AM in the early ’70s.
From my show prep notes.
The American Woman origins took the form of a live jam at a curling rink concert in Waterloo, Ontario. The Canadian band was rushing into the second set and began improvising a rhythm to liven up the crowd. Burton Cummings, the lead singer, began improvising lyrics to fit the music. They liked what they had played and noticed a kid with a cassette recorder making a bootleg copy and asked him for the tape. The subsequent studio recording features the original almost completely unchanged; only a few lines were added.
Shortly after its release, The Guess Who were invited to play at the White House. Because of its supposed anti-American lyrics, Pat Nixon asked that they not play American Woman.