海狗 (Zalophus californianus) California Sea Lion (十页之四)
理发店形式的 和声 四人组 是美国音乐里 独特的表演方法。 http://en.wikipedia.org/wiki/Barbershop_quartet
A barbershop quartet is a quartet of singers who sing music in the barbershop genre. It consists of a lead, the vocal part which generally carries the tune; a bass,
the part which provides the bass line to the melody; a tenor, the part which harmonizes above the lead; and a baritone, the part that completes the chord. The
baritone can sing either above or below the lead singer.
Quartets can be male or female, but are generally not mixed. A female barbershop quartet may be referred to as a Sweet Adelines quartet, and the vocal parts
have the same labels, since the roles perform similar functions in the quartet even though the vocal ranges are different.
请看大土佬儿组织，指挥的海狗 barbershop quartet 表演。