"Yesterday" is a pop song originally recorded by The Beatles for their album "Help!" (1965). According to the Guinness Book of Records, "Yesterday" has the most cover versions of any song ever written, while BMI asserts that it was performed over seven million times in the 20th century alone. The song remains popular today with more than 3000 recorded cover versions. Some sources still assert that "White Christmas" by Bing Crosby has more cover versions.
https://en.wikipedia.org/wiki/Yesterday_%28song%29