Kaj Chydenius is a Finnish composer and musician, known for his politically charged and socially conscious music. Born in 1939, he became a prominent figure in Finland's cultural scene, particularly during the 1960s and 1970s. Chydenius is recognized for setting poetry to music and for his strong ties to leftist movements. His work often blends classical elements with contemporary themes, and he has composed for theatre, film, and solo performance.