The Beethoven Quartet, formally known as the Beethoven String Quartet, refers to a group of string quartets composed by Ludwig van Beethoven. These works, written between 1800 and 1826, are significant in the classical music repertoire and showcase Beethoven's innovative approach to harmony and form. The quartets are often celebrated for their emotional depth and complexity. The most famous of these quartets include String Quartet No. 7 in F major, Op. 59, No. 1 and String Quartet No. 14 in C-sharp minor, Op. 131. Each quartet typically features two violins, a viola, and a cello, allowing for rich interplay among the instruments. The Beethoven Quartets have influenced many composers and remain a staple in chamber music performances today.