On June 13, 1965, a song was recorded by The Beatles that would become their most famous song and the most recorded song of all-time with over 2,500 cover versions. The song was “Yesterday” but Paul McCartney was the only one who played on it and he also wrote the song (it is credited as Lennon-McCartney but actually John didn’t contribute). Paul had his backup only by a string quartet on the song recorded for the British album titled “HELP!”