We usually leave either the radio (classical or 80s channel) or the tv (Animal Planet or the Food Network) on when we are out. I have absolutely no idea if the hounds like it or would prefer silence... but I like to think they do.
I left the TV on once for Molly when I went to go take a shower and I turned her crate around so she could see it. I came out of the shower to find her watching Law and Order in rapt attention, so it might be a good idea to have something on.
I leave a radio on for Fin during the day when I'm working. I leave on sports talk radio for him. Like Chloe's Mommy said, I have no idea if it work but it makes me feel better. I think the sound of talking would soothe them, but for all I know he could be thinking I wish that person would shut up.
Back before Jersey's separation anxiety got too serious and I could leave her alone I used to leave the radio on for her. I would set up a video camera to see how she was doing when I wasn't home. Whenever a U2 song came on, Jersey would calm down...can dogs take after their human moms?
People think we are nuts, but we leave the TV on too...always have for both of our boys. They particularly like the court tv shows, Regis and Kelly, the View, and weather report. It think it's just the noise so that they know that someone is there...or at least they aren't alone. Give it a try...just choose wisely, they are spark pups that may pick up some bad habits if watching the wrong shows...parental control )