A simple mod to replace most of the boss themes with music from Camellia / Cametek. He's that EDM artist famous for breaking a lot of rhythm gamers' fingers and/or arms. You might've heard of him... if you have, I'm sorry for the various appendages he's broken.

Obviously, the boss music will be replaced, but also, when a boss is defeated, they'll drop a CD with their boss theme in it. Then, in Boss Rush, there's a friendly NPC named Rei (what a coincidence! How similar to Rai!) at Mari's table. They'll give you a CD Key to activate a jukebox (the Humphrey), so you can play the songs with the CDs whenever you want.

The music replaced:

• Pluto (Bermuda Δ Triangle)
• Download Window / Roboheart (FINAL BLENDERMAN APPEARED.)
• Space Ex-Boyfriend (Body F10ating in the Zero Gravity Space)
• King Crawler / Carnivore (Жужжалка76)
• Maximi family (Wolves Standing Towards Enemies)
• Sweetheart (Flamewall)
• Mr. Jawsum (Compute it with some Devilish Alcoholic Steam Engines)
• Pluto EX (ΩΩPARTS)
• Slime Girls (Tentacular Aliens' Epic Extraterretterrestrial Jungle Dance Party Inside Of A Super-Ultra-Mega-Gigantic U.F.O (It Maybe U.U.F.O.) Silently Flying Over Illinois St.)
• Space Husband (Nacreous Snowmelt)
• Unbread Twins (Lúin Øf CeltchaЯ)
• Perfectheart (#1f1e33 (#00102g version))

Some notes:

• If you're loading a save file directly to Boss Rush and don't have the CDs, you can just do the Boss Rush to get the CDs again.
• If you forgot to fight Pluto, then the Pluto & Earth fight will drop Pluto's CD instead of Pluto EX's. You can get Pluto EX's CD in the Boss Rush.
• Thank you to Meme Goat and Jakeyboiii for recommending a few songs.

Anyways, enjoy these bangers!