Members extend over five continents and belong to more than 500 choruses and 1,200 quartets. Today's Sweet Adelines choruses and quartets sing exciting a cappella, four-part harmony music, barbershop style. The music includes special arrangements of today's ballads and upbeat songs, popular show tunes, and even jazz. Members say that singing the powerfully balanced sounds of barbershop harmony provides a rich, rewarding experience.