"In the evening, for the first time, we played Robert's quartet in E flat, and I was charmed again by this beautiful work, so juvenile". This is how Clara Schumann expressed her enthusiasm in 1842. To prepare, Schumann had studied the string quartets of Viennese classics. All the parts of the quartet are thus balanced, according to a marked style of chamber music, interpenetrate and form a magnificent ensemble. Due to the complexity of the sources, our Urtext edition is accompanied by a detailed critical commentary. In the form of a leaflet, the cello part responds specifically to the practice. The String Quartet for Piano and Strings and the Piano and Strings Quintet op. 44, characterized by "sister works", were composed by Schumann in his year "chamber music". As a result, at the same time we publish the two works in 2006, the Schumann year.