The Fratellis are a Scottish rock band formed in 2005 in Glasgow. The group consists of three members: Jon Fratelli, Barry Fratelli, and Minni Fratelli. They gained popularity with their debut album, "Costello Music," which features hit singles like "Chelsea Dagger" and "Whistle for the Choir." Known for their energetic sound and catchy melodies, the Fratellis blend elements of rock, pop, and indie music. They have released several albums over the years, continuing to tour and perform, maintaining a loyal fan base while contributing to the UK music scene.