Before revision: Acoustic amplifiers These amplifiers are intended for acoustic instruments such as violin ("fiddle"), mandolin, ("harp") and acoustic guitar—especially for the way musicians play these instruments in quieter genres such as folk and bluegrass.
After revision: Acoustic amplifiers These amplifiers are intended for acoustic instruments such as violin ("fiddle"), mandolin, harp, and acoustic guitar—especially for the way musicians play these instruments in quieter genres such as folk and bluegrass.