Man singing on a stage while playing the guitar.
A man is talking to people on a stage.
Talking and singing are two different actions that use vocal cords so you can do either one or the other at a time.
(x)
exists e1 x1 x2 x3.(to(e1,x2) & on(x2,x3) & n_stage(x3) & n_people(x2) & Actor(e1,x1) & v_talk(e1) & n_man(x1))