A man in a green shirt playing an acoustic guitar.
A man plays the piano
one is playing a guitar while the other one is playing the piano
exists e1 s1 s2 x1 x2 x3 x4.(a_topic(x1) & in(x1,x2) & Theme(e1,x4) & Actor(e1,x3) & v_play(e1) & n_guitar(x4) & a_acoustic(s2) & Theme(s2,x4) & (x2 = x3) & n_shirt(x2) & a_green(s1) & Theme(s1,x2) & n_man(x1))
exists e1 x1 x2.(n_piano(x2) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_man(x1))