"Hunter of the Damned" by Micheal Loncor for Prof.
Sample lines:
"The courtroom and the classroom were the places I belonged,
But ancient evil came and made me battle the unknown."
"All my life I searched for truth, for knowledge of the light,
Now I hunt the demon breed, the raptors of the night."
"Where once I strove for sanity, to know and understand,
Now I'm God's own holy madman, The Hunter of the Damned!
With cross and fire, stake and sword, I roam a blasted land;
Now I am Van Helsing, The Hunter of the Damned!"
The Fractured States are certainly a blasted land, and while I haven't seen Prof use crosses or stakes, he does use fires and a sword. Mainly, the idea of the peaceful, scholarly man forced to fight against evil creatures when nobody else can fits him perfectly.
"Laws" from Heralds, Harpers, and Havoc seems to fit Vin's changing view of life.
Heralds, Harpers & Havoc 11 Laws - YouTube
It seems kind of weird to use songs written about the characters of other books, but several of them do fit. Any other filk fans on this thread? (If you haven't heard of it before, yes, 'filk' is the correct spelling. It's music based off of books, usually sci-fi/fantasy. Sadly, there are few quality filk recordings for Sanderson novels, but I've found a couple.)
"Avalon Is Risen" by Isaac Bonewits for Sazed. It's about nearly dead religions being revived.
Leslie Fish: Avalon is Risen - YouTube
"Chickasaw Mountain" by Leslie Fish for the Nightwatcher. It's about making deals with the "Lady of the Morning Star" who lives in a patch of eternal darkness on the side of Chickasaw Mountain.
Leslie Fish -- "Chickasaw Mountain" - YouTube
Maybe "Philosophy" from Heralds, Harpers, and Havoc for Lift, because it's about a thief roughly her age who believes in committing his petty larcenies with cheer and style:
Heralds, Harpers & Havoc 04 Philosophy - YouTube
"Send In the Silver Gryphons" by Michael Loncor for the Reckoners as a group.
Send in the Silver Gryphons, by Mercedes Lackey, Owl's Flight - YouTube
"March of Cambreadth" by Heather Alexander for the Alethi people with their cultural and religious fixation on war.
March of Cambreadth - YouTube
"Not Dead Yet" by Styx for Kaladin and Kelsier, because they were both put through things that were meant to kill them, but came back and raised merry hell for the people who put them there.
Styx - Not Dead Yet (1990) - YouTube
"The Gods Aren't Crazy" (They're Only Drunk) by Leslie Fish for Lightsong, because while he can't actually get drunk, he tries very hard. It also fits with his theory that the universe is controlled by a drunk monkey.
The Gods Aren't Crazy Lyrics - YouTube
Edit: Added links to the songs I could find online and removed the sample lines for the songs that now have direct links.