A man sitting at a piano singing.
A man using his vocal cords to produce sound in a harmonious way.
Singing is the act of an animal using vocal cords to produce sound in a harmonious way.
exists e1 x1 x2 x3 x4.(a_topic(x1) & at(e1,x3) & n_singing(x3) & of(x3,x4) & n_piano(x4) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_man(x1))
exists e1 p1 s1 x1 x2 x3 x4.(a_topic(x1) & Topic(e1,p1) & exists e2 s2 x5 x6.(in(e2,x6) & n_way(x6) & a_harmonious(s2) & Theme(s2,x6) & Theme(e2,x5) & Actor(e2,x2) & v_produce(e2) & n_sound(x5)) & Theme(e1,x4) & Actor(e1,x3) & v_use(e1) & n_cord(x4) & a_vocal(s1) & Theme(s1,x4) & of(x4,x1) & n_male(x1) & (x1 = x3) & (x1 = x2) & n_man(x1))