This release is Erwin Stein's chamber arrangement of Gustav Mahler's Symphony No. 4. In 1921, Arnold Schoenberg organized a series of private concerts, performed by small ensembles. Schoenberg and Stein combined their ingenuity and created "sophisticated versions" of important orchestral works. These arrangements were usually for a few woodwinds, a string quintet, percussion and piano. Stein also added a harmonium, which was quite rare at the time but the organ adds a unique timbre to this arrangement.