A man in a black shirt and cap playing piano.
There is a man playing the saxophone in the band.
There is no indication there is a saxophone present. Not all people playing piano or saxophone are in the band.
exists s1 x1 x2 x3 x4 x5 x6.(a_topic(x1) & in(x1,x2) & n_piano(x4) & of(x4,x6) & n_playing(x6) & of(x4,x5) & n_cap(x5) & n_shirt(x3) & a_black(s1) & Theme(s1,x3) & subset_of(x4,x2) & subset_of(x3,x2) & n_man(x1))
exists p1 x1 x4 x5.(n_band(x5) & n_saxophone(x4) & exists e1 x2 x3.((x1 = x2) & in(e1,x5) & Theme(e1,x4) & Actor(e1,x3) & v_play(e1) & (x2 = x3) & n_man(x2)))