A bassist and a guitarist are performing at a concert.
The band is playing Come Sail Away.
That the musicians are performing does imply anything about what they are playing, such as Come Sail Away.
exists e1 x1 x2 x3 x4.(at(e1,x4) & n_concert(x4) & Actor(e1,x1) & v_perform(e1) & subset_of(x3,x1) & n_guitarist(x3) & subset_of(x2,x1) & n_bassist(x2))
exists e1 x1 x2 x3 x4.(ne_org_away(x2) & (x2 = x4) & ne_org_sail(x4) & (x2 = x3) & ne_org_come(x3) & n_band(x1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1))