Lute
From Memory Alpha, the free Star Trek reference
A lute was a variety of stringed musical instrument favored by several different cultures including Humans, Vulcans, and Bajorans.
Spock played a Vulcan lute, also known as a lyrette, on several occasions and was quite proficient at it.
While under the euphoric effects of Harry Mudd's love potion, Lieutenant Arex sat at his station on the bridge of the USS Enterprise and did nothing but play a lute. (TAS: "Mudd's Passion")
