A middle-age man in a wheelchair playing guitar on the streets.
There is a man playing "Stairway to Heaven" on his guitar.
Playing guitar does not necessarily mean playing 'Stairway to Heaven'.
exists e1 s1 x1 x2 x3 x4 x5.(n_street(x5) & a_topic(x1) & in(x1,x2) & on(e1,x5) & Theme(e1,x4) & Actor(e1,x3) & v_play(e1) & n_guitar(x4) & (x2 = x3) & n_wheelchair(x2) & n_man(x1) & a_middle-age(s1) & Theme(s1,x1))
exists p1 x1 x5.(ne_org_stairway(x5) & exists e1 p2 x2 x3 x4 x6.((x1 = x2) & Topic(e1,p2) & exists e2.(on(e2,x6) & Actor(e2,x3) & v_heaven(e2)) & n_guitar(x6) & of(x6,x2) & n_male(x2) & Theme(e1,x5) & Actor(e1,x4) & v_play(e1) & (x2 = x4) & (x2 = x3) & n_man(x2)))