Bouncing balls turn into music Arpie is a novel musical app that allows anyone to enjoy music. Put balls as many as you like, then watch them playing a beautiful melody. Higher balls hit the keys with long pauses, and lower ones hit them fast and repeatedly. By combining them, you can easily create a wide variety of musical sequences. Arpie (アルピー)は誰でも簡単に楽しめる音楽アプリです。操作方法は簡単、画面をタッチしてボールを置くだけ。跳ね回るボール