Cello
The cello was an Earth musical instrument, bigger than a viola and smaller than a double bass. It was a member of the violin family. 

A cello was part of the string quartet hallucinated by a crewmember of the  when the Traveler brought the ship and crew to the end of the universe. ()

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

One of the musicians at the Mozart concert held for Ambassador Sarek and his wife Perrin played the cello. ()

Miles O'Brien once stated to Jake Sisko that he knew how Jake felt, while discussing Jake's desire not to go to Starfleet Academy despite his father's wishes that he joined. Miles explained that his father wanted him to be a musician, specifically a cello player. Miles explained that his father made him practice every day, until he "got to be pretty good." Then, when Miles was seventeen, his father sent a recorded audition to the Aldeberan Music Academy, where he was eventually accepted. Unhappy with the prospect, Miles went into town two days before he was due to leave and signed up for Starfleet. () While serving aboard the  Miles would occasionally play cello with his fellow crew in Ten Forward. () Like his former crewmate, Ensign Cheney also played the cello. ()

Kasha Tal was the first host of the  to learn to play cello, influencing Gray Tal and later Adira Tal to pick up. ()

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de:Cello
Earth musical instruments