Listen to I Must Be In Love (as made famous by The Rutles) online. I Must Be In Love (as made famous by The Rutles) is an English language song and is sung by Hilarious Hit Makers. I Must Be In Love (as made famous by The Rutles), from the album Classic Comedy Songs, was released in the year 2009. The duration of the song is 2:07. Download English songs online from JioSaavn.