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.

素乐素歌——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。

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.

符头可以是黑色的（圆形卵形）白色的，用在五线谱上以表明音高。符头的形状在历史上有很多种，比如在单音歌颂中。

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。

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.

符头可以是黑色的（圆形卵形）白色的，用在五线谱上以表明音高。符头的形状在历史上有很多种，比如在单音歌颂中。

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.

素乐素歌——教堂传统单音歌颂，依旧采四线谱，早期音乐中，线数目各不相同。

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.

符头可以是黑色（圆形卵形）白色，五线谱上以表明音高。符头形状历史上有很多种，比如单音歌颂中。

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.

素乐素歌——教堂传统单音歌颂，依旧采四线谱，早期音乐中，线数目各不相同。

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.

符头可以是黑（圆形卵形）白，在五线谱上以表明音高。符头形状在历史上有很多种，比如在单音歌颂中。

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.

素乐素——教堂传统单音，依四线谱，早期音乐中，线的数目各不相同。

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.

符头可以是黑色的（圆形卵形）白色的，在五线谱上以表明音高。符头的形状在历史上有很多种，比如在单音中。

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.

素乐素——教堂传统单音颂，依旧线谱，早期音乐中，线数目各不相同。

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.

符头可以是黑色（圆形卵形）白色，在五线谱上以表明音高。符头形状在历史上有很多种，比如在单音颂中。

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。

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.

符头可以是黑的（圆形卵形）的，用在五线谱上以表明音高。符头的形状在历史上有很多种，比如在单音歌颂中。

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.

素乐素歌——教堂传统单音歌颂，依旧采用四线谱，早期音乐中，线数目各不相同。

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.

以是黑色（圆形卵形）白色，用在五线谱上以表明音高。形状在历史上有很多种，比如在单音歌颂中。

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.

素乐素歌——教单音歌颂，依旧采用四线谱，早期音乐中，线的数目各不相同。

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.

符头可以是黑色的（圆形卵形）白色的，用在五线谱上以表明音高。符头的形状在历史上有很多种，比如在单音歌颂中。