Orchestral group playing music.
Rock music played by a band
Just because an orchestral group is playing music doesn't imply rock music played by a band.
exists e1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x4) & Actor(e1,x3) & v_play(e1) & n_music(x4) & (x1 = x3) & n_group(x1) & (x1 = x2) & ne_nam_orchestral(x2))
exists e1 x1 x2 x3.(Actor(e1,x3) & n_band(x3) & Theme(e1,x1) & v_play(e1) & n_music(x1) & (x1 = x2) & ne_per_rock(x2))