In a choir, there are up to 5 parts: soprano, alto, tenor, baritone, and bass. A cappella can also have those 5 parts. A difference is with percussion. With musical instruments, percussion is done with musical instruments that you hit, such as drums. In an a cappella performance, a person makes the percussion sound. For a beatbox performance, performers make sounds like electric drums, synthesizer and electric guitar. Another part of percussion in a cappella performance is making classical drum sounds for tapping the beat.