The Four Aces version of Mr. Sandman played upon Marty McFly's arrival in Hill Valley in 1955.
The Four Aces is a traditional pop music quartet that formed in 1950. They recorded a version of Mr. Sandman in 1954.
When Marty McFly first arrived at Courthouse Square in Hill Valley in 1955, the Four Aces version of Mr. Sandman was playing on a speaker at Roy's Records.
