A band practicing for a gig.
The band plays music.
If a band is practicing, then it is implied that they are playing music.
exists x1 x2 x3.(a_topic(x1) & for(x1,x3) & n_gig(x3) & n_practicing(x1) & of(x1,x2) & n_band(x2))
exists e1 x1 x2.(n_band(x1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_music(x2))