Old MacDonald Had a Farm' (5 letters) The term 'Classic Song' can be summarized by two crossword solutions: 'OLDIE' and 'Old MacDonald Had a Farm'. 'OLDIE' is a term used to describe a song that has been around for a long time, usually from the 1940s to the 1980s. 'Old MacDonald Had a Farm' is a popular children's song that was first published in the early 1900s. It is still sung today and is considered a classic song.