Black Sabbath formed in 1968. The band was originally named Earth and they played blues-rock music. In the band's early days Tony Iommi had a work accident that cut off the tips of his middle and ring finger on his right hand. He began tuning his guitar lower to slacken his strings to make playing easier on his wounded fingers. The result was a darker, deeper tone to his guitar sound which the band felt made their music sound dark and scary. The music also featured unusual key changes and time signatures (metre). They released their first album "Black Sabbath" in 1970. Their most successful single, titled "Paranoid", produced by Rodger Bain, came off their second album of the same name, also released in 1970.