A quartet is performing inside.
Musicians are playing outside.
A quartet is a group of musicians.
exists e1 s1 x1.(a_inside(s1) & Manner(e1,s1) & Actor(e1,x1) & v_perform(e1) & n_quartet(x1))
exists e1 x1 x2.(ne_nam_musicians(x1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_outside(x2))