Before the "carnival" theme was moved from Coney Maul to Nightmare Alley, it played a 45 minute long track, so it's a bit tough to narrow down your search. Here are two tracks that feature your Ringmaster:
http://www.youtube.com/watch?v=LhjEVO0_FoU
http://www.youtube.com/watch?v=LYYFOowsFfk
As for the Howl-o-Fest music, that's harder to narrow down. There were separate tracks at Front Gate, The Picnic Grove/Waterpark Walkway, and the rest of the park; the latter being several hours long.