A group of young and old practice together for an instrumental performance.
There are people playing instruments.
A group of young and old people practice playing instruments together for an instrumental performance.
exists s1 s2 s3 x1 x2 x3.(a_topic(x1) & for(x1,x3) & n_performance(x3) & a_instrumental(s3) & Theme(s3,x3) & r_together(x1) & of(x1,x2) & n_practice(x2) & a_old(s2) & Theme(s2,x2) & a_young(s1) & Theme(s1,x2) & n_group(x1))
exists p1 x1 e1 x2 x3 x4.((x1 = x2) & Theme(e1,x4) & Actor(e1,x3) & v_play(e1) & n_instrument(x4) & (x2 = x3) & n_people(x2))