Consider the following premises. There is at least one y for which y is poor if and only if y is an office clerk. For all y, y will listen to a song if and only if y is an office clerk. Can we infer the following from them? If we can, name the inference rule being used: For all y, the fact that y were poor does not imply that y is listening to a song.
That contradicts the premises. Therefore the answer is no.