The Beatles had so many hit songs throughout their career, and many of them were penned by Lennon and McCartney. But “Yesterday” is one of the best-known and most successful of their songs. In fact, at one point it was the most covered song of all time. The signature song was apparently composed by McCartney all in his head while dreaming.
He had been staying with a then-girlfriend, and he woke up immediately, rushed to the piano, and began to play so he wouldn’t forget the song. Her family couldn’t have been too happy at being woken by it. But, they get to be a part of this awesome piece of Beatles history as a result!