A band performs on a stage.
A band performs.
'A band performs' is a short version of 'A band performs on a stage'.
exists e1 x1 x2.(on(e1,x2) & n_stage(x2) & Actor(e1,x1) & v_perform(e1) & n_band(x1))
exists e1 x1.(Actor(e1,x1) & v_perform(e1) & n_band(x1))