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，早期音乐中，的目各不相同。

Noteheads may be black (a circular or oval shape filled in) or white and are used on the staff to indicate pitch. The shape of noteheads has differed historically, as in plainchant.

符头黑色的（圆形或卵形）或白色的，用在五上表明音高。符头的形状在历史上有很多种，比如在单音歌颂中。