A man playing a guitar while a couple is listening and watching another man dancing to the music.
A man is playing rock music on a guitar.
Guitar playing does not imply that rock music is the type of music being played.
exists e1 p1 x1 x2 x3 x8.(n_music(x8) & a_topic(x1) & exists e4 e3 e2 x4 x5 x6 x7.(Theme(e4,x6) & Actor(e4,x5) & v_watch(e4) & to(e3,x8) & Actor(e3,x7) & v_dance(e3) & (x6 = x7) & n_man(x6) & -(x6 = x1) & n_couple(x5) & Actor(e2,x4) & v_listen(e2) & n_couple(x4)) & n_man(x1) & n_man(x1) & while(e1,p1) & Theme(e1,x3) & Actor(e1,x2) & v_play(e1) & n_guitar(x3) & (x1 = x2))
exists e1 x1 x2 x3 x4.(on(e1,x4) & n_guitar(x4) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_music(x2) & of(x2,x3) & n_rock(x3) & n_man(x1))