A middle-aged man is sitting down and playing the accordion.
A zydeco musicain practices.
A person playing an accordion might not be a musicain. He could be simply playing with an instrument he has no idea how to play.
exists e1 e2 s1 s2 s3 x1 x2 x3.(n_accordion(x3) & Theme(e2,x3) & Actor(e2,x2) & v_play(e2) & n_man(x2) & a_middle-aged(s3) & Theme(s3,x2) & a_down(s2) & Manner(e1,s2) & Actor(e1,x1) & v_sit(e1) & n_man(x1) & a_middle-aged(s1) & Theme(s1,x1))
exists x1 x2 x3.(a_topic(x1) & n_practice(x1) & of(x1,x3) & n_musicain(x3) & of(x1,x2) & n_zydeco(x2))