Book (Practical) Politics, economy, and society Books that Improve Your Voice - How to "Dr. Voice" Five minutes a day gives you confidence in your songs and voice!
※Please note that product information is not in full comprehensive meaning because of the machine translation.
Japanese title: 単行本(実用) 政治・経済・社会 声がよくなる本-”ヴォイス博士”の方法1日5分で歌と声に自信がつく!