Answer:
Yes, the most significant figure in the collapse of tonality is generally considered to be the Austrian composer Arnold Schoenberg. Schoenberg is known for developing the twelve-tone technique, also known as serialism, which was a radical departure from traditional tonal music. In this technique, the twelve notes of the chromatic scale are organized into a series or row that is used to create the musical material for a composition, without any one note being emphasized over the others. This resulted in music that did not adhere to traditional tonal structures or chord progressions, and was a major influence on the development of atonal and experimental music in the 20th century. Schoenberg's music and ideas were highly influential in the development of modern classical music.