Two musicians are playing a duet one on a harp and the other on a violin.
Two musicians are playing a duet in Vienna.
The first sentence does not say the musicians are playing in Vienna.
exists e1 x1 x2 x3 x4 x5 x6.(n_other(x5) & on(e1,x6) & n_violin(x6) & on(e1,x3) & subset_of(x5,x3) & subset_of(x4,x3) & n_harp(x4) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_duet(x2) & card_eq_1(x2) & n_musician(x1) & card_eq_2(x1))
exists e1 x1 x2 x3.(ne_geo_vienna(x3) & in(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_duet(x2) & n_musician(x1) & card_eq_2(x1))