Karlheinz Stockhausen (1928-2007) was a pioneering German composer widely regarded as one of the most important figures in 20th-century avant-garde music. He is known for his innovative compositions that often pushed the boundaries of traditional musical forms and techniques. Stockhausen's works spanned various genres, including electronic music, aleatory (chance) composition, and serialism. His groundbreaking pieces, such as "Kontakte" and "Gruppen," explored new sonic possibilities and profoundly influenced generations of composers. Additionally, Stockhausen's theoretical writings on music and his visionary approach to composition continue to inspire musicians and scholars alike.