This isn't a code (so not for ar) but you can try this (i found it on
http://www.chaptercheats.com/):
All Songs in the Jukebox
To get a Perfect on a song, you MUST wait until it has been chosen as a Perfect-eligible song which happens at random times (you'll know this when the frame for the stage changes and becomes wider and more colourful), otherwise your Perfect will not count. You have 3 attempts at getting a Perfect before its eligibility ceases, where it will either disappear for a while or change to a different stage. Note: You can attempt a Perfect on a stage even if you've failed the initial 3 attempts, but you must wait again until it is chosen as Perfect-eligible.