Hipster performs on the acoustic guitar.
A person is tuning a piano.
Not every person is a hipster.  Performs on an acoustic guitar is not the same as tuning on a piano.  An acoustic guitar is not typically used in tuning a piano.
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 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_tune(e1) & n_piano(x2) & n_person(x1))