A resonator guitar is an acoustic guitar whose sound is produced by one or more metal cones called resonators. Resonator guitars were designed to be louder than conventional acoustic guitars often overwhelmed by other instruments such as horns and percussion instruments. They became famous for their unique sound and found life with bluegrass and also blues styles. The name steel guitar is inspired not from the material of which the guitar is made, but from the name of the steel, a slide held in the left hand. The resonator guitar was introduced to bluegrass music by Josh Graves who played with Flatt and Scruggs in the mid 1950s