A group of musicians are playing instruments as the leader leads them.
Some person who is shown is conducting or directing musicians.
Some person conducting and directing musicians is a rephrasing for a leader leads a group of musicians.
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 e2 e1 x1 x2 x3.(Theme(e2,x3) & Actor(e2,x1) & v_conduct(e2) & n_musician(x3) & Theme(e1,x2) & v_show(e1) & (x1 = x2) & n_person(x1)) | exists e3 e4 x4 x5 x6.(Theme(e4,x6) & Actor(e4,x4) & v_direct(e4) & n_musician(x6) & Theme(e3,x5) & v_show(e3) & (x4 = x5) & n_person(x4)))