The instrument often used in jazz music that has keys is the saxophone. Invented by Adolphe Sax in the 1840s, it combines the qualities of brass and woodwind instruments, featuring a single-reed mouthpiece. The saxophone is celebrated for its versatility, emotive sound, and ability to navigate various styles within jazz, from smooth to avant-garde. It is commonly associated with jazz legends, including Charlie Parker and John Coltrane, contributing to the genre's rich history and evolution. The saxophone's expressive capabilities make it a staple in modern music.