Kurt,
I don't know whether you like classical music or not. Even if you are not much attracted to it, I would strongly recommend that you get J. S. Bach's cello suites played by Yo Yo Ma, one of the best cellists at present. There is a lot of upper bass content in that recording.
The recording is recent and amazing and that music can be classified as some type of easy listening stuff. If you don't know Bach's music, you would happen to get acquainted with one of the masterpieces of one of the top musical geniuses at his best:
Yo-Yo Ma - Six Evolutions - Bach: Cello Suites - Amazon.com Music
www.amazon.com
Cheers,
André