String Quartet No. 9 in C major, Op. 59, No. 3 is a chamber music composition by Ludwig van Beethoven, completed in 1806. It is part of a set of three quartets commissioned by the Russian nobleman Count Joseph von Razumovsky. This piece showcases Beethoven's innovative approach to harmony and structure, reflecting his transition from the Classical to the Romantic style. The quartet consists of four movements: Allegro, Andante con moto, Scherzo, and Allegro. Each movement features distinct themes and intricate interplay between the instruments, highlighting the unique voices of the first violin, second violin, viola, and cello. This work is celebrated for its emotional depth and technical demands.