Classical-era exemplars by Joseph Haydn and Ludwig van Beethoven.
The Classical Style
Haydn: Quartet in C major for Strings, Hob. III: 57, Op. 54, No. 2
Danish String Quartet
Beethoven: Trio in E-flat major for Piano, Violin, and Cello, Op. 1, No. 1
Wu Han, piano; Arnaud Sussmann, violin; Paul Watkins, cello