Singing out of tune is a recurring problem that we hear from performers. An important element of the barbershop “lock and ring” sound is in-tune singing. We need to sing quality musical tones that are specifically in pitch to the anticipated melodic line. To make this happen, we must sing in tune both horizontally and vertically.
By definition, Barbershop vocal harmony, as categorised during the barbershop revival era (1930s–present), is the art of singing a cappella, or unaccompanied vocal music. A lot of the music sung by Barbershop choirs will come from this era of the 1930s although nowadays there is a much wider repertoire available.