http://www.fimfiction.net/story/2235/tangled-up-i...
Tangled Up in Blues

This story follows background pony Blues through life, love and jazz. Lots and lots of jazz.
It's by The Descendant so probably gets a fair amount of traffic, but it is pretty old and I think overlooked for how good it is.
One of the few stories i have to be careful with, because if I start reading it I WILL read it all the way through, every time. It's perfect.

What an excellent feild! As a medic, seeing this stuff all the time and not being able to do much is horrible. Go kick its ass!