作者自己的介绍
由作者本人在 YouTube 上撰写，Youtop 未做修改。
something something music theory.
Patreon: https://www.patreon.com/12tonevideos
Mailing list: http://eepurl.com/bD4LeT
Facebook: https://www.facebook.com/12tonevideos
Twitter: https://twitter.com/12tonevideos
Email: 12tone@nebula.tv