Consider the following premises. For all x_6, if x_6 were a server, then x_6 is listening to a song. For all x_6, x_6 is an electrician. There is at least one x_6 for which x_6 will listen to a song if and only if x_6 is an electrician. Can we infer the following from them? For all x_6, x_6 will not listen to a song.
 From the fact that for all x_6, x_6 is an electrician we can infer that for all x_6, x_6 is an electrician or x_6 is a server. From the fact that there is at least one x_6 for which x_6 will listen to a song if and only if x_6 is an electrician we can infer that there is at least one x_6 for which if x_6 were an electrician, then x_6 is listening to a song. Finally, from the fact that there is at least one x_6 for which if x_6 were an electrician, then x_6 is listening to a song, that for all x_6, if x_6 were a server, then x_6 is listening to a song, and that for all x_6, x_6 is an electrician or x_6 is a server we can infer that there is at least one x_6 for which x_6 will listen to a song, which contradicts that For all x_6, x_6 will not listen to a song. Therefore, the answer is no.