A group of musicians are playing instruments as the leader leads them.
Someone in the group is playing trumpet.
It doesnt specify that anyone plays the trumpet, or any specific instrument.
exists e1 p1 x1 x2 x3 x4.(n_leader(x4) & exists e2.(Theme(e2,x1) & Actor(e2,x4) & v_lead(e2)) & n_thing(x1) & as(e1,p1) & Theme(e1,x3) & Actor(e1,x1) & v_play(e1) & n_instrument(x3) & of(x1,x2) & n_musician(x2) & n_group(x1))
exists e1 x1 x2 x3.(n_group(x2) & Theme(e1,x3) & Actor(e1,x1) & v_play(e1) & n_trumpet(x3) & in(x1,x2) & n_person(x1))