Here is the link to the maker of PINKISS.
http://www.tatsu-mi.co.jp/game/product/index.html#PR100
Though they do not have English page, you can ask them of the default music via e-mail at
oubo1@tatsu-mi.co.jp . Write them in plain English. This e-mail address seems to be recruit purpose but they will foreword it to suitable division.