A scruffy looking man is playing guitar and singing.
The man is at a nightclub.
Not all solo guitar performances are in a nightclub.
exists e1 e2 s1 x1 x2 x3 x4.(Theme(e2,x2) & Actor(e2,x1) & v_play(e2) & n_singing(x4) & n_guitar(x3) & subset_of(x4,x2) & subset_of(x3,x2) & n_man(x1) & Actor(e1,x1) & v_look(e1) & a_scruffy(s1) & Theme(s1,x1))
exists p1 x1.(n_man(x1) & exists x2.(at(x1,x2) & n_nightclub(x2)))