See A cappella.
a genre (usually a cappella) of Black vocal-harmony music of the 1950s that evolved in New York City from gospel singing
folk music consisting of a genre of a cappella music originating with Black slaves in the United States and featuring call and response
a cappella singing
[网络] 无乐器伴奏的歌唱；清歌；阿卡贝拉无伴奏演唱
