(ttps://www.sankei.com/economy/news/191030/prl1910300413-n1.html )
(ttps://www.youtube.com/watch?v=k4nz1Ldhzxw&list=RD_oC292XRq2o )
ｅasy piano
(ttps://www.youtube.com/watch?v=2_4Si4P11jU )
Easy to Complex
(ttps://www.youtube.com/watch?v=m6buIdQacoM )
(ttps://dictionary.goo.ne.jp/word/en/composition/ )
> (ttp://i.ytimg.com/vi/n0Z_JYsuH6M/maxresdefault.jpg )