MD has not uploaded Brazen Blaze soundtrack to YouTube or anywhere else. Brazen Blaze uses CRI ADX Audio middleware and its files cannot be opened with just any audio player, as they are encoded in a proprietary format. Here is a small guide on how to listen to the soundtrack outside of the game. This guide assumes you have a PC running Windows with Brazen Blaze downloaded from Steam.
Do this at your own risk. I am not responsible for breaking your system.
foo_input_vgmstream.fb2k-componentCRI ADX Audio files end with .acb files extension. In brazen blaze, they are located in brazenblaze_Data\StreamingAssets\adx2 subfolders. For example, background music is located in brazenblaze_Data\StreamingAssets\adx2\bgm folder.
To locate your game files, go to Steam, Right click on Brazen Blaze in library and select Manage -> Browse local files.
To open one of the audio files, Open foobar2000 and either use File -> Open... or just drag and drop an .acb file to the playlist area.
One .acb file may contain multiple tracks inside it. Some tracks are split up into multiple subtracks.
To make the audio file playable with your preferred audio player, you can convert the tracks to a more standard audio format.
In playlist, select all the tracks you want to convert, right click on them and select Convert -> default or Convert -> ... if you want to customize the conversion process.
The following files contain the Background music from the lobby. Some other files contain duplicates. But also feel free to check out other files in the bgm folder to find character selection and in game music. Those do tend to be split up to many small tracks, though.
These descriptions are probably not accurate.
It's kinda odd that the English version of the tracks don't have vocals, even though the vocals are in English.
The files and names may change as the game gets updated. These we're checked with game version 2.1.0