A lone musician in black is on stage, playing an acoustic guitar and singing into a microphone.
A musician performs at a concert.
The musician doesn't necessarily has to performs at a concert he could be just practicing
exists e2 e1 p1 s1 s2 x1 x2 x3 x4.(for(p1,e2) & into(e2,x4) & n_microphone(x4) & Actor(e2,x1) & v_sing(e2) & for(p1,e1) & Theme(e1,x3) & Actor(e1,x1) & v_play(e1) & n_guitar(x3) & a_acoustic(s2) & Theme(s2,x3) & exists x5.(on(x1,x5) & n_stage(x5)) & in(x1,x2) & n_black(x2) & n_musician(x1) & a_lone(s1) & Theme(s1,x1))
exists e1 x1 x2.(at(e1,x2) & n_concert(x2) & Actor(e1,x1) & v_perform(e1) & n_musician(x1))