Violin
The violin was an Earth musical instrument used in many styles of compositions, but was most commonly associated with European classical music. 

When discussing Tribbles, Spock noted to Dr. McCoy that while they were "nice, soft, and furry and they make a pleasant sound", a violin covered in ermine would be the same, and he would "see no advantage in having one." ()

Replicators aboard the  were programmed to manufacture musical instruments, like violins. Data was an accomplished violinist capable of reproducing or blending many styles of performance. Recitals in Ten Forward were commonplace, and Data performed with many musicians, including Dr. Juliana Tainer and Lieutenant Jenna D'Sora. ()

During a date with Christy Henshaw, Geordi La Forge called up a gypsy violinist to play for her. ()

During their Sherlock Holmes holoprogram, Data told La Forge about Holmes' famous violin, bought for fifty-five shillings in Tottenham Court Road. He then played the instrument. ()

Two violins, a viola, and a cello formed a string quartet. ()

When Sarek and Perrin visited the Enterprise in 2366, Data played a string piece by Mozart in a concert. ()

When affected by a alien probe, Barclay taught violin technique in the Enterprise music school, much to the surprise of Riker and Crusher. ()

Commander Riker once stated that the Enterprise was "not a violin" when the crew tried to stimulate the vibration of a cosmic string in order to break free from the influence of two-dimensional beings. ()

Data kept a violin in his quarters aboard the Enterprise-D, placed in a shelf. ()

Data told Artim that he played the violin and chess when asked if machines played. ()

Ensign Bradward Boimler of the  was skilled violinist who played a electric violin. He dedicated several compositions such as "Essence" and "Requiem for a Hug". Unfortunately, his violin was destroyed when Lieutenant Shaxs believed was the source of the loud noise. Boimler obtained another violin, which was transformed into a D'Arsay artifact by Minooki in 2382. ()

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Earth musical instruments