John Travolta and Olivia Newton-John are most recognized as a duo for their work on the soundtrack of the 1978 film adaptation of the musical, "Grease." Their music, a blend of pop and rock-and-roll, reflects the 1950s setting of the film and is typified by harmonious duets such as "You're the One That I Want" and "Summer Nights." Both artists had separate music careers, with Newton-John's soft pop and country style leading to numerous awards and Travolta's ventures into pop-disco earning him chart-topping singles. Their collaborative work on "Grease," however, has had a lasting impact on popular culture and remains a significant contribution to the film musical genre.