The Jukebox
To the right of the shop in the intermission town is a Jukebox that, when you have acquired CDs for it, will let you listen to a sizable chunk of the game's excellent music, a lot of the tracks aren't on the game's official GOD TRACKS OST so it can be somewhat worthwhile tracking them all down, although Clover makes it so you have to get over some ridiculous hurdles to get all 4 CDs.
The Jukebox becomes usable the instant you get your first CD, when you do, head to the Jukebox and press O.
Unlock Info
CD A
Beat the game on Normal mode.
CD B
Head into the Casino and play the slot machine on either floor until you win a prize ticket by getting a line of prize boxes on the slots.
Head back to the ground floor to where the 3 big chests are, talk to the bunny girl to the right of the chests to make sure that you can actually get the CD, she'll tell you if you can, finally pick a chest and pray to god you pick the right one, the CD is only in one chest, the others are duds, also the CD's placement is randomized every time you try and miss. If you pick the wrong one it's back to the slot machine unless you have more than one prize ticket.
God Yeah this one's a bitch to get =_=
CD C*
Remember that Kick Me sign Gene gets on his back at the beginning of Stage 1-2? Well, your objective is to finish the game
with that sign still on Gene's back.
Just one problem…… Using Roulette moves or a God Hand unleash will blow the sign off Gene's back, which means you can't use either until you've won! Holy crap! Fortunately the Kick Me Sign challenge can be done on any difficulty including Easy so there's your leeway.
CD D*
Finish the game on Hard mode. Good luck! You'll bloody need it!
Want to download these CD tracks? Visit the OST section.