Can I switch out the soundtrack with JSRF?

[Blood Parade]

I just prefer the soundtrack of JSRF, with most of my favorite themes being from it, ex.:
https://www.youtube.com/watch?v=-6lEm2ei3Kg

Is there a way I can just pack some MP3s into the game's music format?

[Fork9]

Yeah why can't we play this any other music in Jet Set Radio HD this situation sucks

[Deadwood]

While it is possible, it's an absurd amount of work. Being a music modder for this game myself, I can show you how to do it if you really want to give it a shot, but the way this game handles audio is bizarre.

[Viridia Lacrymosa]

well something you can do which is what I normally do is that you can go to the options setting, turn down the volume of the music (it increases the sound effect volume for some god forbid reason) and find a mix with the full soundtrack on youtube and open it on the steam browser. I have my own mix I like to listen specifically while playing this game, I even made it my startup site on the steam browser. If that's not stable for you, you can try and download the soundtrack from somewhere like khinsider and play it with the steam mp3 player.