“Thanks to her constant touring, which almost always included performances of her own music, Clara was probably a better-known composer than Robert when they married,” (LA Philharmonic). “The Four Polonaises of her Op. 1 (not her actual first compositions) had been published when she was 11 years old, to be followed by numerous other solo piano pieces and her Concerto.
After her marriage, Clara turned to larger forms, studying jointly with Robert through all of his enthusiasms. Their influences were mutual – composed in 1846, Clara’s Piano Trio in G minor, Op. 17, was a direct influence on Robert’s Piano Trio in D minor, Op. 63, written the following year. (Robert’s own G-minor Piano Trio would be composed in 1851.) After Robert wrote his trios, Clara lost confidence in hers, but Brahms was one of many others who also played the work.”
While the Trio’s first movement, Allegro Moderato, begins in G minor, one of several harmonic shifts begins early (1:18) as a change in emphasis to the relative Bb major takes root.