Explain how musical systems and theories were broken down and redefined in the process of experimental music development.

The development of experimental music is fundamentally defined by a consistent process of challenging and redefining established musical systems and theories. This process has been driven by a desire to explore new sonic possibilities, question conventional aesthetics, and expand the expressive range of music itself. From the rejection of tonal harmony to the embrace of noise, chance, and unconventional forms, experimental music has consistently pushed the boundaries of what is considered musical, resulting in a radical transformation of the sonic landscape. It has moved beyond mere aesthetic considerations and has often taken on a social and political context as well. One of the most profound breaks with traditional music involved the rejection of tonality, the system of harmonic relationships based on a central key, which had dominated Western music for centuries. Early experimental composers began to explore atonality, a system that lacked a tonal center, moving beyond traditional notions of consonance, dissonance, and harmonic function. Arnold Schoenberg's development of serialism or the twelve-tone technique, formalized the concept of atonality by treating all twelve notes of the chromatic scale equally, without reference to a tonic. This method was not simply a rejection of tonality but rather a systematic way of composing in the absence of it. It created a whole new set of rules and compositional ideas that were completely unique and radically different from the traditional system. His pieces such as "Pierrot Lunaire" used this technique to move beyond the traditional harmonic structures and explore a new sonic vocabulary. The exploration of microtonality represented another majo....