Misja Mengelberg (1935-2021) was a prominent Dutch pianist, composer, and conductor, known for his influential role in the avant-garde and free jazz movements. His genre spans contemporary classical music, free improvisation, and jazz, reflecting a unique blend of influences. Mengelberg was a key figure in the Dutch jazz scene, particularly through his association with the Instant Composers Pool (ICP), which he co-founded in the 1960s. This ensemble became a hub for innovative musicians, pushing the boundaries of traditional jazz. Notable works include his compositions for the ICP Orchestra and various collaborations with artists like Willem Breuker and Han Bennink. His impact on music extends beyond performance; Mengelberg was an advocate for improvisation and experimental music, inspiring generations of musicians to explore the intersections of genres. His approach emphasized spontaneity and collaboration, which reshaped the landscape of contemporary jazz and improvised music. Mengelberg's contributions continue to resonate, marking him as a significant figure in both Dutch music history and the global avant-garde scene.