Claire Guerreso is an American singer, songwriter and multi-instrumentalist from Boulder, Colorado, United States, who is best known for her music featured on TV, film, ads, and promos as well as her work with various artists.

Entertainment Television series The Royals, NBC's Heartbeat, Fox's legal drama Proven Innocent, All American, Ford, and Boohoo clothing.

Another one of Guerreso's songs, "Save Yourself", which had her on lead vocals under the name Claire de Lune, was featured in the official trailer for the critically acclaimed movie, Mad Max: Fury Road.

Guerreso's song and vocals on "Skipping Stones" created a buzz online after being featured on ABC family's Pretty Little Liars (season 6).

In 2021, Guerreso released "No Turning Back" (for NBC’s The Blacklist), “In Our Blood" (for ESPN’s SEC College Softball Promo), and "Broken" (for The CW's The American), respectfully.