Olivia Newton-John and John Travolta in the 1978 film "Grease." | © Copyright Paramount Pictures
Olivia Newton-John and John Travolta's new Christmas album titled "This Christmas."
As they drove off into the celluloid heavens at the end of the film “Grease,” Olivia Newton-John and John Travolta sailed off into movie musical history. The soundtrack from the 1978 film is among the Top Ten best-sellers of all time, and their duet of …