A man is playing guitar at a stage performance.
A man is in a band.
A person can play guitar solo and doesn't have to be in a band to give a stage performance.
exists e1 x1 x2 x3 x4.(at(e1,x3) & n_performance(x3) & of(x3,x4) & n_stage(x4) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_guitar(x2) & n_man(x1))
exists p1 x1.(exists x2.(in(x1,x2) & n_band(x2)) & n_man(x1))