Hans Koller, born in Vienna in 1921, was a pioneering figure in European post-war jazz, renowned for his unique sound on the tenor saxophone and his fearless exploration of various jazz styles. After serving in the armed forces during World War II, Koller returned to Vienna and quickly made a name for himself, playing with the Hot Club of Vienna and later emigrating to further his musical journey. Throughout his career, he collaborated with legendary musicians such as Dizzy Gillespie, Benny Goodman, and Stan Kenton, leaving an indelible mark on the jazz scene. Koller's discography spans genres like cool jazz, free jazz, and even krautrock, showcasing his versatility and innovative spirit. He led numerous ensembles, including the Free Sound and International Brass Company, and was known for his compelling compositions and arrangements. Koller's legacy as a composer, bandleader, and painter continues to inspire jazz enthusiasts and musicians alike, cementing his status as one of the most important European jazz musicians of the 20th century.