All guitars have essentially the same structure and parts. There is the headstock, which includes tuning machines and the nut; the neck, which includes the fretboard and frets; and the body, which includes the saddle and bridge hardware. Additionally, electric guitars have pickups, volume and tone controls, a pickup selector, and an output jack. Acoustic guitars usually have a round sound hole in the middle of the body, where the pickups sit on an electric.