Klingon concertina

From Memory Alpha, the free Star Trek reference

The Klingon concertina is a small, handheld Klingon musical instrument.

The Klingon chef aboard Deep Space 9 owned one of these instruments and often used it to entertain his customers. (DS9: "Playing God")

The book The Making of Deep Space Nine revealed, that in typical Klingon fashion, this concertina could also be used as a weapon.