The electric guitar was introduced in the 1930s as hollow body guitars with electromagnetic transducers. They were first used prominently in jazz music. Key parts of electric guitars include the pickups, neck, body, frets, bridge, tuning pegs, headstock, and nut. Common electric guitar woods include maple for the body. Electric guitars vary in their number of frets, from 19 to 24, and come in many shapes and sizes, from brands like Fender.