The term key note comes from the [[practice]] of [https://en.wikipedia.org/wiki/A_cappella a cappella], often [https://en.wikipedia.org/wiki/Barbershop_singers barbershop singers], playing a note before [[singing]]. The note played determines the key in which the song will be performed. | The term key note comes from the [[practice]] of [https://en.wikipedia.org/wiki/A_cappella a cappella], often [https://en.wikipedia.org/wiki/Barbershop_singers barbershop singers], playing a note before [[singing]]. The note played determines the key in which the song will be performed. |