The document summarizes the evolution of the clarinet over six main stages from ancient instruments to the modern clarinet. It began as the chalumeau over 5,000 years ago, was developed into a two-key instrument by Denner in the 18th century, reached five keys by 1800, and gained more keys throughout the 19th century culminating in Muller's 13-key and Baermann's 17-key models. Minor refinements by Albert and Buffet led to the modern clarinet of five pieces and 17 keys made of plastic or wood. Famous clarinetists such as Goodman, Drucker, Daniels, and Shifrin have performed classical and jazz music to popularize the instrument.