The members of One Direction singing on stage.
The band is performing
Singing is one way to be performing.
exists e1 x1 x2 x3 x4.(n_member(x1) & a_topic(x1) & of(x1,x2) & on(e1,x4) & n_stage(x4) & Actor(e1,x3) & v_sing(e1) & (x2 = x3) & n_direction(x2) & card_eq_1(x2))
exists e1 x1.(n_band(x1) & Actor(e1,x1) & v_perform(e1))