A four piece band playing on stage before some people.
A band is practacing alone.
There would be no people if the band were practicing alone.
exists e1 x1 x2 x3 x4 x5.(a_topic(x1) & before(e1,x5) & n_people(x5) & on(e1,x4) & n_stage(x4) & Actor(e1,x3) & v_play(e1) & (x1 = x3) & Time(x1,x2) & n_band(x2) & n_piece(x1) & card_eq_4(x1))
exists e1 s1 x1.(a_alone(s1) & Manner(e1,s1) & Actor(e1,x1) & v_practace(e1) & n_band(x1))