Final answer:
Hector Berlioz demonstrates innovative orchestration by using a variety of instruments to create different timbres within his compositions, thereby shaping a rich and expressive soundscape.
Step-by-step explanation:
The combination of different instruments Berlioz uses at different times in the piece to create a variety of timbres demonstrates his innovative orchestration. Hector Berlioz was known for his progressive and bold approach to composition, often challenging his audiences with new musical forms and instrumental combinations. Through carefully selecting instruments for their unique sounds—or timbres—Berlioz crafted rich, complex soundscapes that were unconventional at the time. The timbre of an instrument, defined by the frequency, amplitude, and timing of its sound waves, gives each one its distinctive voice. By blending these voices, Berlioz effectively used orchestration not just as a tool for arrangement, but as a powerful means of expression within his music.