A group of people holding music instruments.
The people are really good with their instruments.
Just because people are holding musical instruments does not mean that they are really good with them, they may not know how to play at all.
exists e1 x1 x2 x3 x4 x5.(a_topic(x1) & of(x1,x2) & Theme(e1,x4) & Actor(e1,x3) & v_hold(e1) & n_instrument(x4) & of(x4,x5) & n_music(x5) & (x2 = x3) & n_people(x2) & n_group(x1))
exists s1 x1 x2.(n_instrument(x2) & of(x2,x1) & n_thing(x1) & n_people(x1) & r_really(s1) & with(s1,x2) & Theme(s1,x1) & a_good(s1))