Dimensions of Energy in Shostakovich's Symphonies

Shostakovich's music is often described as being dynamic, energetic. But what is meant by 'energy' in music? After setting out a broad conceptual framework for approaching this question, Michael Rofe proposes various potential sources of the perceived energy in Shostakovich's symphonies, describing also the historical significance of energeticist thought in Soviet Russia during the composer's formative years.