Hipster performs on the acoustic guitar.
a lame old man plays saxophone
A lame old man is not necessarily a hipster.  Hipster typically refers to a younger person who is hip or cool. The acoustic guitar is a different instrument than a saxophone.
exists e1 s1 x1 x2.(n_guitar(x2) & a_acoustic(s1) & Theme(s1,x2) & ne_nam_hipster(x1) & on(e1,x2) & Actor(e1,x1) & v_perform(e1))
exists e1 s1 s2 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_saxophone(x2) & n_man(x1) & a_old(s2) & Theme(s2,x1) & a_lame(s1) & Theme(s1,x1))