A rock band is playing for a crowd.
A rock band is playing music.
IF a rock band is playing, it follows that they are playing music.
exists e1 x1 x2 x3.(for(e1,x3) & n_crowd(x3) & Actor(e1,x1) & v_play(e1) & n_band(x1) & of(x1,x2) & n_rock(x2))
exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_play(e1) & n_music(x3) & n_band(x1) & of(x1,x2) & n_rock(x2))