"Bein' Green," originally titled "Green," is one of Kermit the Frog's best-known songs. It was written in 1970 by Joe Raposo for the first season of Sesame Street, and has since become an American standard.
Links:
https://www.youtube.com/watch?v=z4ZxxHbJGbY
The film chronicles Henson's life, from the early years of his career to the creation of properties like the Muppets, Sesame Street, and The Dark Crystal, and also focuses on his creative and romantic partnership with his wife Jane Henson.