The lead guitarist is playing on stage.
A guitarist plays.
plays is another form of playing.
exists e1 x1 x2 x3.(n_guitarist(x1) & of(x1,x2) & n_lead(x2) & on(e1,x3) & n_stage(x3) & Actor(e1,x1) & v_play(e1))
exists e1 x1.(Actor(e1,x1) & v_play(e1) & n_guitarist(x1))