When I first discovered Kingdom Hearts in 2002, it also, thanks to a catchy, melancholy Utada Hikaru tune, introduced me to the wonderful world of J-pop. Music has been embedded within the franchise's DNA throughout all of its daffy, emotional, lore-stuffed titles. So in a sense, I shouldn't be surprised in the form the latest title has taken. And yet, here I am. Surprised, and delighted, to learn that the upcoming Kingdom Hearts: Melody of Memory is a full-on, straight up rhythm game. As Collider's resident music dorkus, rhythm video games are especially important …