Under a Blanket of Blue is an American popular song written by Jerry Livingston with lyrics by Marty Symes and Al J. Neiburg. It was published in 1933 by Santly Bros and was first recorded by Glen Gray and his Casa Loma Orchestra with Kenny Sargent on vocals, released as a Brunswick single (6584), reaching number 6 on the Billboard chart in July 1933; a month later Don Bestor and His Orchestra also charged to the charts at number 8. The tune is a cozy ballad about a couple snuggled under a deep blue night sky, a nocturnal romance rather than a daytime scene. It quickly became a jazz and pop standard, with many artists recording notable versions over the years including Coleman Hawkins, Woody Herman, Helen Forrest, Stan Kenton, Benny Goodman, and Frank Sinatra. A famous vocal duet interpretation appears on the 1956 album Ella and Louis by Ella Fitzgerald and Louis Armstrong, and Sinatra performed it on his 1955 To Be Perfectly Frank radio series. The song remains a popular and frequently performed piece in both pop and jazz repertoires, celebrated for its dreamy nocturnal imagery and enduring melody.