When greyhounds are being raised and living at the tracks, they have music playing 24 hours a day! So, when people first adopt a greyhound, we tell them that it might lessen the separartion anxiety problems if they leav a radio or TV on when they leave the dog. We did that with Paula when we first got her, but stopped it when we got Buddy. We aren't big music fans, so we rarely have the radio on in the house.
However, the dogs love being sung to! I sing TERRIBLY and yet they love it when I lay down next to them and sing a soft song. Usually I just make up my own words and put it to a lulaby-type melody.