Why did Arnold Schoenberg orchestrate Johannes Brahms’s Piano Quartet in G Minor?

In the context of musical criticism, Arnold Schoenberg’s 1937 orchestration of Johannes Brahms’s Piano Quartet in G Minor, Opus 25, serves as a profound act of creative criticism.1

As a young musician, Schoenberg frequently performed the quartet and was consistently troubled by issues of balance, specifically that the piano tended to overwhelm the strings, rendering parts of the work intermittently inaudible. By orchestrating the piece, Schoenberg sought to rectify these acoustic imbalances and ensure the music achieved its intended total aural impact.1

Schoenberg viewed this project as an exercise in musical audibility—a way for one master to assist another in communicating more effectively. This act exemplifies the principle that revision can function as a form of high-level criticism, where a composer modifies a work to better align the utterance with the original musical idea.1