A group of four people singing is called a quartet.
Solo acapella. Sorry, that is two words . . .
No, it is the present participle of "to sing" and may be a verb, noun (gerund), or adjective (e.g. singing carolers).
Pianissimo would apply, but even quieter that that (ppp) Pianississimo is the word
You might be looking for the term polyphonic. Its basically the only term to describe the technique.
Technical singing focuses on one's pitch, range, vibrato, registers, and several other techniques used during singing. Technical singing comes from the word technique. Technical singing is important in a singer (whether opera, musical theatre, jazz) because technical singing provides a more natural sound and conserves your voice for a longer period of time. A lot of people can be great singers but not know all of technical singing. Technical singing is what makes the difference between a good singer and a fantastic singer. Extremely good technical singers are Barbra Streisand, Whitney Houston, Mariah Carey, and Beyonce. These women use the rules of technical singing and apply them to their songs.
Quartet.
Scat.
look
Soloist
"Melisma" is the term used for singing of a single syllable over a succession of musical notes. This singing style is called melismatic.
ones
Free, sole, or solo.
Solo acapella. Sorry, that is two words . . .
Unified timbre is another meaning of the word harmony. When all persons singing, sing in harmony, the song is by far more pleasant to the listener.
Kuimba is the official Luhya word for the English word singing.
no, the real word for persons is PEOPLE !!
No, "singing" is not a compound word. It is a single word that functions as a verb, describing the action of producing musical sounds with the voice.