While Brahms had decided to put an end to his career of "serious" composer with the Quintet in G Major Op. 111, he changed his mind and composed the clarinet trio and quintet. He would later compose the clarinet sonata, which he simultaneously arranges for the viola.

This documentary narrates the events that brought Brahms to the composition of this sonata, relying on archive photographs and biographical details on the great composer who was already on the brinks of 20th century composition techniques. Following this introduction, Pinchas Zukerman (viola and violin) and Mark Neikrug (piano) play the integrality of Brahms' Sonatas for violin and viola Op. 120.