A man with a guitar is at a microphone while the drummer seems to be resting and the other guitarist has his back to him.
The man is an expert.
man doesn't always mean  expert.
exists p1 p2 x1 x2 x4 x5 x6.(n_male(x4) & n_male(x4) & n_back(x6) & of(x6,x4) & -(x5 = x5) & n_guitarist(x5) & n_drummer(x4) & exists e2 e1 p3.(Theme(e2,x6) & Actor(e2,x5) & v_have(e2) & to(x6,x4) & Topic(e1,p3) & Actor(e1,x4) & v_seem(e1) & exists e3.(Actor(e3,x4) & v_rest(e3))) & while(p1,p2) & exists x3.(at(x1,x3) & n_microphone(x3)) & with(x1,x2) & n_guitar(x2) & n_man(x1))
exists p1 x1.(n_man(x1) & exists x2.((x1 = x2) & n_expert(x2)))