1. The shape of noteheads has differed historically, as in plainchant.
符头的形状在历史上有很多种，比如在单音歌颂中。
plainchant的解释
2. The printing presses of Solesmes and Ligugé(both now confiscated by the French Government) have produced much excellent typographical work, whilst the study and restoration of the traditional plainchant of the Church in the same monasteries, under DD.
该印刷机的索雷姆和Ligugé产生了许多优秀的印刷工作，同时研究和恢复传统的plainchant教会在同一寺院，根据差异。
3. Plainchant or plainsong, the traditional monodic chant of the Catholic Church, still uses a four-line stave, and in earlier music the number of lines used varied.
素乐或素歌——教堂传统单音歌颂，依旧采用四线谱，早期音乐中，线的数目各不相同。
noun
1. a liturgical chant of the Roman Catholic Church
Synonym: plainsong Gregorian chant