A band plays as they sing along with the music.
A band is playing music.
A band is playing music is another way to say a band plays music.
exists e1 p1 x1 x2.(n_music(x2) & exists e2.(with(e2,x2) & r_along(e2) & Actor(e2,x1) & v_sing(e2)) & n_thing(x1) & as(e1,p1) & Actor(e1,x1) & v_play(e1) & n_band(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_music(x2) & n_band(x1))