If you mean not so much harmony, then I would say duet or trio or even quartet. If you mean there is background harmony, then solo or duet or trio or quartet with accompaniment. If you mean that there are some notes that sound as if they exist but they don't, then they're called ghost notes.
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"recitativo secco", where the one singing has light accompaniment or none at all. Any accompaniment is in the form of light chording under the voice.
Abba was the band that sung the song 'Waterloo'.
ABBA sung the eagle song
It is sung in Korean.
What song sung by sting has lyrics my one and only love in it