Léon Francioli, a Swiss bassist born in 1946 and passed away in 2016, left an indelible mark on the world of free jazz and Brazilian jazz. Renowned for his powerful and resonant bass lines, Francioli's playing was a force to be reckoned with, as evidenced by his collaborations with legendary musicians like Don Cherry, John Tchicai, and Michel Portal. His notable performances include a memorable show at Montreux in 1971 and the 1980 recording "Musical Monsters," which showcases his extraordinary talent. Francioli's music is a testament to his innovative spirit and deep musicality, making him a standout figure in the jazz world.