A band is playing on the sidewalk while people watch.
The band is playing music.
If a band is playing, it follows that they are playing music.
exists e1 p1 x1 x2.(n_sidewalk(x2) & exists e2 x3.(Actor(e2,x3) & v_watch(e2) & n_people(x3)) & while(e1,p1) & on(e1,x2) & Actor(e1,x1) & v_play(e1) & n_band(x1))
exists e1 x1 x2.(n_band(x1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_music(x2))