a musician in a white shirt is playing his black violin.
A violinist is working on a composition.
Not all musician is working on a composition.
exists e1 s1 s2 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_play(e1) & n_violin(x3) & a_black(s2) & Theme(s2,x3) & of(x3,x1) & n_male(x1) & in(x1,x2) & n_shirt(x2) & a_white(s1) & Theme(s1,x2) & n_musician(x1))
exists e1 x1 x2.(on(e1,x2) & n_composition(x2) & Actor(e1,x1) & v_work(e1) & n_violinist(x1))