A trio of men performing music.
Man singing
men performing music implies that they are singing.
exists e1 x1 x2 x3 x4.(a_topic(x1) & of(x1,x2) & Theme(e1,x4) & Actor(e1,x3) & v_perform(e1) & n_music(x4) & (x2 = x3) & n_man(x2) & n_trio(x1))
exists x1 x2.(n_singing(x1) & of(x1,x2) & n_man(x2) & a_topic(x1))