A jazz riff is a short, repeated musical phrase that is used to create an improvisational solo. The term 'LICK' is often used to refer to a jazz riff, and it is made up of four letters. A LICK is a melodic phrase that is used to create a solo or to provide accompaniment to a song. It is usually composed of several notes that are played in a specific order. Jazz riffs are often used to create a unique sound and to add interest to a song.