The man in the black shirt is playing the electric keyboard.
The man is practicing a song.
just because a man is playing the electric keyboard doesn't mean he is practicing a song
exists e1 s1 s2 x1 x2 x3.(n_keyboard(x3) & a_electric(s2) & Theme(s2,x3) & n_shirt(x2) & a_black(s1) & Theme(s1,x2) & n_man(x1) & Theme(e1,x3) & Actor(e1,x1) & v_play(e1) & in(x1,x2))
exists e1 x1 x2.(n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_practice(e1) & n_song(x2))