A man sits and performs at a piano
A man play music.
Playing music is a performance.
exists e2 e1 x1 x2 x3.(at(e2,x3) & n_piano(x3) & Actor(e2,x2) & v_perform(e2) & n_man(x2) & Actor(e1,x1) & v_sit(e1) & n_man(x1))
exists x1 x2 x3.(a_topic(x1) & Time(x1,x3) & n_music(x3) & n_play(x1) & of(x1,x2) & n_man(x2))