Crooning a tune is a term used to describe a type of singing that is characterized by a smooth, gentle, and melodic vocal style. It is often associated with popular music from the 1920s and 1930s, as well as jazz and blues. The term 'CROON' comes from the Old English word 'CRONE, ' which means to hum or sing softly. Crooning a tune is a form of vocal expression that has been around for centuries and is still popular today.