First Symphony: Listenable; somewhat modern. Tonal – but tonality shifts – characterized by a moderate amount of harmonic dissonance.
Second Symphony: To “October” – B Major (scary key). No recognizable melody or tonality. Structure and instrumentation are new: It is in one movement and finishes with a chorus.
A constructivist work: Totally independent movement of various instrumental parts – inclusive of things like an F# factory whistle.
Third Symphony: “First of May” Unifying Rhythm rather than a musical theme. A tonal work. No fixed key (polytonal – but E flat Major) Mild harmonic dissonance.