Koos Speenhoff (1858–1945) was a Dutch singer-songwriter and musician, renowned for his contributions to the genre of cabaret music. Born in The Hague, he rose to prominence in the late 19th and early 20th centuries, becoming a significant figure in the Dutch entertainment scene. Speenhoff was particularly known for his witty and often satirical lyricism, which addressed social issues and everyday life, making his performances both entertaining and thought-provoking. Notable works include songs like "De Vlieger," "De Zwarte Dood," and "Zeg, Ken Jij Die Nog?" which reflect his unique blend of humor and poignancy. His style often combined elements of folk music with the theatricality of cabaret, influencing future generations of Dutch artists in the genre. Speenhoff's impact on music is evident in his role in popularizing cabaret as a significant form of cultural expression in the Netherlands. His legacy continues to influence contemporary Dutch musicians and cabaret performers, as he paved the way for the integration of social commentary in popular song.