James McCartney and Sean Ono Lennon, sons of Paul McCartney and John Lennon, collaborate on a new song "Primrose Hill," with a contest for romantic couple videos using the song.

James McCartney, son of Paul McCartney, and Sean Ono Lennon, son of John Lennon, have collaborated on a new song titled "Primrose Hill". The musical duo co-wrote the track and James McCartney is hosting a contest for couples, asking them to share romantic videos using the song in the background. Winners of the contest may be featured in the music video.