Sherlock Holmes plays the violin in BBC Sherlock.
The instrument is both a practical detail and a character clue. When Sherlock has no case demanding his attention, he uses violin playing and composition to occupy his exceptionally active mind. The series also shows music as part of his investigative process, reflecting the original Sherlock Holmes stories, where Holmes famously plays the violin.
This is not merely a background prop. Sherlock sometimes plays, experiments with musical ideas, or asks Mrs Hudson to tolerate his practice. His violin helps communicate his boredom, concentration, and unusual habits. The modern series updates many Victorian details, but keeps Holmes’s musical ability as a recognizable link to Arthur Conan Doyle’s character.
A common mix-up is confusing Sherlock’s violin with the cello, another string instrument sometimes associated with dramatic detective imagery. The show’s Holmes is specifically a violinist; he is not primarily presented as a pianist or clarinetist.