Talk:Mio Akiyama Trivia/@comment-24373936-20140119033150/@comment-38036173-20190307090332

It is implied early on, that Tsumugi is the composer for all their songs. Being a classically trained pianist, she would generally need to know more music theory than Mio, Yui and Ritsu (Azusa is the daughter of two jazz musicians, so chances are her knowledge of music theory is pretty advanced too).