Who is a pioneer of "Minimal Music" in 1960s?

Steve Reich is widely regarded as a pioneer of minimal music in the 1960s due to his groundbreaking compositions that exemplified the minimalist aesthetic. With pieces like "It's Gonna Rain" (1965) and "Come Out" (1966), Reich explored the concept of phasing, where repetitive patterns gradually shift out of sync with each other, producing mesmerizing and hypnotic musical experiences. These compositions, characterized by their simplicity, subtle variations, and focus on rhythmic and melodic textures, pushed the boundaries of traditional music and laid the foundation for the development of minimalist music in the decade and beyond.