Handel's other famous works include the Messiah and the Royal Fireworks Music. Sometimes one group will sound by itself, and sometimes two will sound at the same time. Once in a while they all play together. Antiphonal music is music that contains short themes or phrases that echo back and forth, the echo often beginning before the theme ends. Call and response is one kind of antiphonal music.
Composers sometimes use one set of sounds alternating with another set of sounds.
Set up a steady beat on a drum as students walk that beat in random space. At appropriate points change the tempo expecting students to act accordingly. Largo for very slow, Andante for walking tempo, Allegro for fast, Presto for very fast. Repeat step one using only the Italian terminology. Relate things we do in daily life that follow these different tempos.