Several people waiting to play musical instruments
People are waiting to perform.
People may play musical instruments not to perform, but for practice.
exists e1 p1 s1 x1 x2.(a_topic(x1) & Topic(e1,p1) & Actor(e1,x2) & v_wait(e1) & exists e2 s2 x3.(Theme(e2,x3) & Actor(e2,x2) & v_play(e2) & n_instrument(x3) & a_musical(s2) & Theme(s2,x3)) & (x1 = x2) & n_people(x1) & a_several(s1) & Theme(s1,x1))
exists e1 p1 x1.(Topic(e1,p1) & Actor(e1,x1) & v_wait(e1) & exists e2.(Actor(e2,x1) & v_perform(e2)) & n_people(x1))