Quite a few people have pointed us at this, and I suspect most of 'em got it from Kotaku, so let's give 'em a link. Brentalfloss adds his own lyrics to the always atmospheric Baba Yetu theme tune from Civ 4. Watch below!
Also, it's apparently properly endorsed by the original composer Christopher Tin, who you can buy his music from here.
I may start re-playing Civ4 actually, to sort of cement myself in the position of elderly luddite of RPS.