Simeon ten Holt (1923–2012) was a Dutch composer primarily known for his minimalist and contemporary classical music. His work is characterized by its meditative quality and often involves long, sustained tones and repetitive structures, which encourage deep listening. Ten Holt's most notable piece is "Canto Ostinato," composed in 1976, which can be performed by various instruments and allows for significant improvisation and variation in its execution. This piece has gained immense popularity and has been performed in numerous settings worldwide, often lasting several hours. Ten Holt's music often blurs the lines between composer and performer, allowing musicians to interpret his works freely, a concept that has influenced the performance practice in contemporary classical music. His impact extends beyond his compositions, as he inspired a generation of musicians and composers to explore the possibilities of minimalist music and the role of the performer in the creative process. His legacy continues through performances of "Canto Ostinato" and his other works, which remain central to discussions of modern minimalist music.