Background music during Sefirat Ha-Omer

Q: What should a person do if there is background music playing at his work during Sefirat Ha-Omer?
A: He has no choice and he is not obligated to quit his job on account of this. It is called a "benefit which comes to a person against his will" (Pesachim 25b) or in simpler words: "an unintended act." He is not guilty if he hears, but he should not listen. There is a difference between hearing and listening. He may continue to work there.