What is the song in the Coco Chanel ad?

The song featured in the Coco Chanel ad, particularly for the Chanel No. 5 fragrance, is "You're the One That I Want" by John Travolta and Olivia Newton-John from the musical "Grease." This upbeat and iconic track complements the luxurious and vibrant aesthetic of the advertisement. The choice of such a classic song emphasizes the brand's timeless appeal and connection to popular culture.