A man dressed in white plays a keyboard as his band performs.
The man is the lead singer of the band.
We cannot infer that because a man in a band is dressed in white and plays a keyboard, he is lead singer.
exists e1 x1 x2 x3 x4.(a_topic(x1) & all x5.(n_keyboard(x5) -> exists s1 x6.(in(e1,x6) & for(x6,x5) & n_play(x6) & a_white(s1) & Theme(s1,x6))) & as(e1,x3) & n_perform(x3) & of(x3,x4) & n_band(x4) & of(x3,x1) & n_male(x1) & Theme(e1,x2) & v_dress(e1) & (x1 = x2) & n_man(x1))
exists p1 s1 x1 x2 x3.(n_band(x3) & n_singer(x2) & a_lead(s1) & Theme(s1,x2) & n_man(x1) & (x1 = x2) & of(x2,x3))