A TRIO is a singing group of three people. It is a common type of ensemble in music, and can be found in many different genres such as classical, jazz, pop, and folk. A TRIO typically consists of a lead vocalist, a backing vocalist, and an instrumentalist. The lead vocalist usually sings the melody, while the backing vocalist provides harmony and the instrumentalist provides accompaniment. Trios are often used to create a fuller sound than a solo artist or duo, and can be used to create a more intimate atmosphere.