Blues is a music genre and a film is called The Blue Lagoon:

https://en.wikipedia.org/wiki/Blues?

Blues is a music genre and musical form which originated in the Deep South of the United States around the 1860s.

The term Blues may have originated from "blue devils," meaning melancholy and sadness.

Blue Lagoon:

https://en.wikipedia.org/wiki/The_Blue_Lagoon_(1980_film)?