Young rocker is jamming out at a show
The musician is a guitarist.
Not all rocker that jam are guitarist
exists e1 s1 x1 x2 x3.(at(e1,x3) & n_show(x3) & a_out(s1) & Manner(e1,s1) & Actor(e1,x1) & v_jam(e1) & n_rocker(x1) & (x1 = x2) & ne_nam_young(x2))
exists p1 x1.(n_musician(x1) & exists x2.((x1 = x2) & n_guitarist(x2)))