Two guys, one wearing a blue jacket and the other wearing a red jersey play the trumpet together.
A bunch of men are practicing their instruments.
A bunch of men implies more than two.  The two guys were not necessarily practicing, they could have been performing professionally. Instruments could be any musical instrument not just the trumpet.
exists e1 e2 s1 s2 s3 x1 x2 x3 x4 x5 x6 x7.(n_other(x4) & a_together(s3) & Manner(e2,s3) & Theme(e2,x5) & Actor(e2,x4) & v_wear(e2) & n_trumpet(x7) & (x5 = x7) & n_play(x5) & of(x5,x6) & n_jersey(x6) & a_red(s2) & Theme(s2,x5) & Theme(e1,x3) & Actor(e1,x1) & v_wear(e1) & n_jacket(x3) & a_blue(s1) & Theme(s1,x3) & rel(x1,x2) & n_thing(x2) & card_eq_1(x2) & n_guy(x1) & card_eq_2(x1))
exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_practice(e1) & n_instrument(x3) & of(x3,x1) & n_thing(x1) & of(x1,x2) & n_man(x2) & n_bunch(x1))