Two long-haired musicians are playing in the grass separated by some trees from a large building behind them.
Two musicians are practicing for a future gig
Musicians playing doesn't infer  that they are practicing for a gig.
exists e2 e1 s1 s2 x1 x2 x3 x4 x5.(n_thing(x2) & n_grass(x2) & in(e1,x2) & Actor(e2,x4) & from(x4,x5) & behind(x5,x2) & n_building(x5) & a_large(s2) & Theme(s2,x5) & n_tree(x4) & Theme(e2,x3) & v_separate(e2) & (x2 = x3) & Actor(e1,x1) & v_play(e1) & n_musician(x1) & a_long-haired(s1) & Theme(s1,x1) & card_eq_2(x1))
exists e1 s1 x1 x2.(for(e1,x2) & n_gig(x2) & a_future(s1) & Theme(s1,x2) & Actor(e1,x1) & v_practice(e1) & n_musician(x1) & card_eq_2(x1))