Why did Hector Berlioz write a treatise on instrumentation and orchestration?

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symphony performing a concert — symphony Symphony performing a concert at Svetlanov Hall, Moscow International House of Music.

Hector Berlioz wrote his Treatise on Instrumentation and Orchestration (1844) during the Romantic period, an era defined by significant advancements in the art of instrumentation and the increasing importance of instrumental color.1

As one of the most individual orchestrators in music history, Berlioz utilized his deep understanding of instrumental capabilities to expand the size and scope of the orchestra. His work, such as the Symphonie fantastique, demonstrated how orchestral color could be used to suggest specific events or programmatic themes. By documenting these techniques, Berlioz provided the first textbook on the subject, codifying the use of large forces and complex sonorities that would influence 19th- and 20th-century composers, including Richard Strauss and Gustav Mahler.1