A pickup instrument is a guitar or other musical instrument that has a built-in pickup for amplification purposes. Other terms for a pickup instrument include electric guitar, electric bass, acoustic-electric guitar, and semi-acoustic guitar. A solid body electric guitar is a type of pickup instrument that has no acoustic resonance. A semi-acoustic guitar is a guitar that has a hollow body with a solid center block. An acoustic-electric guitar is an acoustic guitar with a pickup system installed. A bass guitar is a type of pickup instrument that is designed to produce low-pitched tones. All of these instruments can be played through an amplifier or sound system, allowing for greater volume and tonal control.