A man playing the guitar for a small group of people.
The man is playing an acoustic guitar.
There are a number of different types of guitars, so to say the man is playing guitar does not imply the guitar is an acoustic guitar.
exists e1 s1 x1 x2 x3 x4 x5.(n_guitar(x3) & a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_play(e1) & for(x3,x4) & of(x4,x5) & n_people(x5) & n_group(x4) & a_small(s1) & Theme(s1,x4) & (x1 = x2) & n_man(x1))
exists e1 s1 x1 x2.(n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_guitar(x2) & a_acoustic(s1) & Theme(s1,x2))