There's a fixed version of this with different songs here.

my ears burn

Audio still sounds like chipmunks.

There are a lot of comments stating that the audio has problems, i assume it's fixed by now?

could you fix the goddamn audio?

I dont understand why you dont just fix the speed issues with the mod then re upload it

Original text
曲が速くなるのはアドオン内の音楽ファイルの周波数が違うためです。
これを解決するためには、まずvpkファイルを"GCFScape"で解凍します。
そのあと、"root\sound"フォルダ内にある音楽を任意のサウンドエディターで開き、周波数を44100Hzに変更します。(16bit, 44100Hz, 2ch)
次に、"Left 4 Dead 2 Authoring Tools"で追加された"vpk.exe"(Steam\steamapps\common\Left 4 Dead 2/bin/vpk.exe)にドラッグ＆ドロップしてvpkファイルを作成した後、元のvpkファイルに上書きしてください。
これで通常の速度で再生されます。

(Google translation Source: Japanese)
The music gets faster because the frequency of the music file in the add-on is different.
To solve this, first extract the vpk file with "GCFScape".
Then open the music in the "root \ sound" folder with any sound editor and change the frequency to 44100 Hz. (16 bits, 44100 Hz, 2 ch)
Next, after dragging and dropping to the "vpk.exe" (Steam \ steamapps \ common \ Left 4 Dead 2 \ bin \ vpk.exe) added by "Left 4 Dead 2 Authoring Tools" to create a vpk file Please overwrite the original vpk file.
This should be played at normal speed.

don't like it

WHY TOO FAST ???? I LOVE THE SONG BUT THE CONCERT IS WAYYY TOOO FAST

Song too fast, very annoying.

If you want to fix the song speed extract the vpk in gcf scape, open the .wavs in audacity > Effect > Change speed -25 percent then save and replace drag and drop root folder on vpk.exe from l4d2 authoring tools and replace the original vpk with the new one.

The songs in the game are TOO FAST!! How to fix this??

Any update on this?

song is unhearably fast. but poster of this mode is awesome. so i want to enjoy changed poster olny

can you upload non-music ver?

could you please fix the problem with the music ?, because it goes so fast that is diffused in some parts.

Okay, cheers.

I've got some problem uloading it on Gamemaps, simply because i've got some internet issues, untill it fixed I can't do anything. When the file is uploaded on gamemaps, i'll do a post here.

When are you gonna put it up on Gamemaps?

my name turducken

these songs are too fast in game, i want to hear clearly!

I had to compress the songs a bit to be able to upload the VPK file on the workshop. I will upload the same mod but with better quality in Gamemaps.com .

Is the voice supposed to be as high pitched as it is in game? The songs do not sound the same as the ones above.

Nice! That is awesome work!

nice 5pb's concert love it thanks for it RATE