音楽の木 Musical tree 木琴を自動演奏するしかけをつくるならどうする？ What will you do if you are going to make a mechanical instrument with an xylophone? フェルトが貼られた板は音符でいえば何？ There are some plates that have felt on their surfaces. Now how do they function as musical notes.? ▼マウスをあててみよう！ 休符 ▼On mouse here! They function as 'rests'. シンプルな自動演奏装置の仕組みを考えます。