In music, an "axe" is a slang term commonly used to refer to a musical instrument, particularly a guitar. Musicians often use this term to describe their instrument in a casual or affectionate way. The term has become popular in various music genres, especially in rock and heavy metal. The origin of the term is somewhat unclear, but it is believed to have emerged in the 1960s. Over time, "axe" has also been used to refer to other stringed instruments, such as the bass guitar. Musicians may say they are "playing the axe" or "jamming on their axe" to convey their passion for music.