An older man sitting against a call with a guitar in his hands.
The older man is a musician.
The man sitting with a guitar may not be a musician. He could be a roadie or just someone holding a guitar for someone else.
exists e1 s1 x1 x2 x3 x4 x5.(a_topic(x1) & with(e1,x4) & in(x4,x5) & n_hand(x5) & of(x5,x1) & n_male(x1) & n_guitar(x4) & against(e1,x3) & n_call(x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_man(x1) & r_more(s1) & a_older(s1) & Theme(s1,x1))
exists p1 s1 x1.(n_man(x1) & r_more(s1) & a_older(s1) & Theme(s1,x1) & exists x2.((x1 = x2) & n_musician(x2)))