When all group members can say their phrases fluently, you are ready to make music. On the count of three, everyone should begin to recite their phrase, with syncopation. Be sure that everyone keeps to the same beat. Improvisation Improvisation is the spontaneous creation, rearrangement, and development of music while playing it. Improvisation is probably one of the key elements in jazz.
Musicians start with a basic musical framework, and develop it as they play.
The same piece never sounds exactly the same two performances in a row. During improvisation, the musicians often take turns as the lead. One musician will play solo melody while the other musicians supply the rhythm and beats. Then they trade off and another musician takes the lead. Now back to your a cappella jazz group.