In House M.D., Gregory House commonly plays the piano.
House's piano playing appears as part of his private life and reinforces the character's intelligence, technical skill, and emotional isolation. He is also shown playing guitar, so the piano is not his only musical instrument in the series.
Music is woven into the show's presentation. Episodes frequently use contemporary songs during montages, and House often connects with music more easily than he connects with colleagues or patients. His home contains instruments and recording equipment, reflecting his interest in playing rather than public performance.
The piano should not be confused with House's medical diagnostic tools. His musical ability is a character detail, while the central professional premise concerns diagnosing patients with unusual conditions. The recurring instrument is one of several clues to House's life outside the hospital.