Keith Whitley's "When You Say Nothing At All".
I made a personal song request from Tim (through the myFanPark.com website) this summer when I had to begin radiation treatments. This song was actually the first one played in the radiation room on my first treatment day and I knew right away that I needed Tim to sing it for me (because I thought he could do it better). He did not disappoint and this is one of my absolute favorites that he's done for me.
Tim actually did a number of videos for me through this whole scary ordeal (from initial diagnosis to being deemed cancer-free) and I could never thank him enough for giving me something happy to focus on during some of the worst days.