A cappella:
A cappella (Italian for "in the manner of the church" or "in the manner of the chapel") music is specifically group or solo singing without instrumental sound, or a piece intended to be performed in this way.
en.wikipedia.org
無伴奏合唱:
无伴奏合唱(a cappella;中文音譯:阿卡貝拉)是一种无伴奏的音乐形式,仅由人声来哼唱出旋律与节奏,有別於文藝復興時期In the 19th century a renewed interest in Renaissance polyphony coupled with an ignorance of the fact that vocal parts were often doubled by instrumentalists led to the term coming to mean unaccompanied vocal music.的交響樂以及巴洛克時期的協奏風格,层次感极强,常見的音樂風格為15和16世紀的教堂音樂,亦有無伴奏樂團利用這種形式來重新編排流行音樂。
zh.wikipedia.org
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A cappella無伴奏合唱