Now let's sing the national anthem in unison with the piano accompaniment.

现在我们在钢琴伴奏下齐唱国歌。

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Unison singing indicates singing in which all singers sing the same notes, without harmony.

一度唱腔就是指所有的演唱者共同演唱同一个音，没有和声。

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Some use meditation, some use repetitive bowing or circling, some have people sing uplifting songs in unison.

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Vice presidents usually sing in harmony, if not in unison, with their boss.

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