A group of musicians are assembled to play music.
Some people are preparing to sing.
The group of musicians may not be singers and are not necessarily preparing to sing.
exists e1 p1 x1 x2 x3 x4.(Topic(e1,p1) & exists e2 x5.(Theme(e2,x5) & Actor(e2,x1) & v_play(e2) & n_music(x5)) & Theme(e1,x3) & v_assemble(e1) & of(x3,x4) & n_musician(x4) & n_group(x3) & of(x1,x2) & n_musician(x2) & n_group(x1))
exists e1 p1 x1.(Topic(e1,p1) & Actor(e1,x1) & v_prepare(e1) & exists e2.(Actor(e2,x1) & v_sing(e2)) & n_people(x1))