A young man in a black shirt playing a xylophone.
A young man plays the xylophone during a musical concert
Just because a man is playing a xylophone does not mean that he is in a musical concert.
exists e1 s1 s2 x1 x2 x3 x4.(a_topic(x1) & in(x1,x2) & Theme(e1,x4) & Actor(e1,x3) & v_play(e1) & n_xylophone(x4) & (x2 = x3) & n_shirt(x2) & a_black(s2) & Theme(s2,x2) & n_man(x1) & a_young(s1) & Theme(s1,x1))
exists e1 s1 s2 x1 x2 x3.(n_xylophone(x2) & during(e1,x3) & n_concert(x3) & a_musical(s2) & Theme(s2,x3) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_man(x1) & a_young(s1) & Theme(s1,x1))