Question is, what do I do about it?

Duke with his girlfriend Mina
Plenty of fresh water, run of the house, toys, Kongs filled with treats. This all helps but my chocolate lab mix is a rescue and he has separation issues. He does best with another dog for a companion but two dogs is something the wife keeps vetoing.
It is some comfort to know that other lab owners have the same concerns. I have seen this same question asked on the web many times. While we are away we fret over what is happening at home. I am fortunate that Duke is not a destructive dog. He is 6 yrs old and full of life as labs are and he gets regular and vigorous exercise. I just know that he is lonely and bored at home alone and I worry about him.
I have video taped him while gone and he paces back and forth climbing up on the kitchen counter so he can look out the windows to the driveway. Up, down, up, down, rarely staying in one place. I can't leave anything on the counters or he will play with it, raw potatoes, cans, paper, etc. Other than that he is great. Maybe all I need is an inexpensive dog sitter!Dog Sitter Directory!
Do dogs like music? Should I leave the TV on? I know he sleeps a lot but other than provide him with a comfortable bed what can I do that will provide him with some entertainment. I rarely leave him for more than four hours at a time but he acts like I have been gone for days when I come home. Any suggestions?