There are a couple of songs about Burke and Hare, the infamous body-snatchers of Edinburgh - they stole bodies to sell to the medical school for dissection. When business picked up, they stopped waiting for already dead bodies and started "helping" local bums become corpses...

One version is in the DT here.

There's a different song on the same topic performed by Ed Miller on his "Live at the Cactus Cafe" CD - the chorus goes:

Burke and Hare were a terrible pair,
Their deeds were beyond belief
For they worked underground in Edinburgh town
The cruelest kind of thief.

Then there's the old-time single entendre song, "It Won't Hurt No More", about a young lady who goes to the doctor/dentist to fix what ails her. It doesn't seem to be in the DT, but Double Decker Stringband does a fine rendition of it on one of their albums. If I get time later, I'll transcribe it.