So yesterday I was farming for Medium armour stuff in Harridan's Lair. In one of the larger open rooms there is a campsite with a Skeleton in the left upper corner.
Through my 10th or 11th run I suddenly heard the femine bard version sing through my headset, which was a very welcoming background filler whilst farming. I was so surprised by the sudden singing, that I tracked down the source, which turned out to be the skeleton.

I ended up sitting there for a few minutes, clapping and listening. My Bosmer vamp is a music fan of course and regrets not pursuing a career as a bard, before he was turned to one of our light skinned blood suckers that can't handle the stage lights.

On a serious note, anyone experienced something like this?