The Bobs are an American a cappella band from San Francisco, California, notable for their unique musical style that combines elements of pop and jazz. Formed in 1981, the group originally consisted of Gunnar Madsen, Richard Greene, Matthew Stull, and Janie Scott. They are recognized for their innovative approach to a cappella, often incorporating elements of humor and theatrics into their performances. Their most influential work includes their rendition of "Helter Skelter," showcasing their ability to mimic instruments with their voices, a technique that has influenced the genre of vocal music.