What style of singing involves creating words and sounds as the music is sung?

Improvisation. There are various types of music in the artistic community, but when it comes to the types that are created alongside sung content and written words, this is most well known for being the vocal type of music. This is due to the fact that vocals are sung alongside the musical tones.

What i think is that it adds loudness for preachers/church choirs. it is also able to hold up a lot of weight without pillars. : )) idek tho