Chapter Numbering – LibreOffice Help

You can modify the heading hierarchy or assign a level in the hierarchy to a custom paragraph style. You can also add chapter and section numbering to heading paragraph styles. By default, the “Heading 1” paragraph style is at the top of the outline hierarchy.

To Add Automatic Numbering to a Heading Style

  1. Choose Tools – Chapter Numbering, and then click the Numbering tab.
  2. In the Paragraph Style box, select the heading style that you want to add chapter numbers to.
  3. In the Numbers box, select the numbering style that you want to use, and then click OK.

To Remove Automatic Chapter Numbering From a Heading Paragraph

  1. Click at the beginning of the text in the heading paragraph, after the number.
  2. Press the Backspace key to delete the number.

To Use a Custom Paragraph Style as a Heading

  1. Choose Tools – Chapter Numbering, and then click the Numbering tab.
  2. Select the custom style in the Paragraph Style box.
  3. Click the heading level that you want to assign to the custom paragraph style in the Level list.
  4. Click OK.

Source: Outline Numbering – LibreOffice Help

Arioso

In classical music, arioso [aˈrjoːzo] (also aria parlante[1] [ˈaːrja parˈlante]) is a type of solo vocal piece, usually occurring in an opera or oratorio, falling somewhere between recitative and aria in style. Literally, arioso means airy. The term arose in the 16th century along with the aforementioned styles and monody. It is commonly confused with recitativo accompagnato.

Arioso is similar to recitative due to its unrestrained structure and inflexions, close to those of speech. It differs, however, in its rhythm. Arioso is similar to aria in its melodic form, both being closer to singing than recitative; however, they differ in form, arioso generally not resorting to the process of repetition.

https://en.wikipedia.org/wiki/Arioso