Yesterday' The SONG 'YESTERDAY' is a classic Beatles SONG written by Paul McCartney and released in 1965. It is one of the most covered songs in history, with over 2, 200 versions recorded by various artists. The SONG is about a man who is reflecting on his past and wishing he could go back to YESTERDAY. The lyrics are melancholic and nostalgic, and the SONG has become an anthem for those who are feeling nostalgic for the past.