If you are talking about the beautiful song playing when Horatio was at Marisol's grave, I was also looking for that song. I had absolutely no luck so I wrote them. This was the response....
You're right, it would be nice for CBS to post the songs used. I think it's just too labor intensive to do that on all their shows, so they've decided not to do it at all. And as opposed to some places like the old WB network that showcased music, they were spotlighting other WB music artists, so it was like a promotion. We use music from all labels and eras.
As for that one song you mentioned, it was actually composed by our show composers. So it is not available for sale, unfortunately.
Thanks for writing and watching...
Corey