Here is my playthrough of Dark Carnival: remix
The campaign was played on expert, in a public, local server, so randoms kept joining and leaving.
The concert music at the end is from an add-on I use, however, due to a bug with the tank music overlaying ontop of the concert music (which happens in normal dark carnival as well) i simply muted the music for that section and overlayed it while editing, which explains why it may sound louder or more clear.

Download Dark Carnival: Remix here; https://steamcommunity.com/sharedfiles/filedetails/?id=1575673903

Come join me and many other left 4 dead players on discord! We're a friendly bunch and I promise we don't bite...unless you look particularily tasty.
Discord: https://discord.gg/FkpqBYF
Steam: http://steamcommunity.com/groups/L4DNationDiscord