I grew up as a 1970's teen - 1980's college, and ALWAYS had music on while I was doing homework and reading for school. I truly believe it helps me concentrate! As a result, I always have something on while I'm working here. I sometimes listen to a CD, and sometimes the radio, but I believe that music keeps me alert and motivated. My favorites are oldies, jazz, and Broadway music.
On the other hand - I absolutely cannot work with the tv on. I never turn it on during daytime hours.
If you sell online, I would be curious as to what you listen to while you are working!