Include the parentheses in this performer formatting.
Everything inside this parenthetical belongs to one styled performer. Leaving either delimiter outside the wrapper assigns that punctuation to the section’s plain performer.
Example
[Verse: A & <i>B</i>]
A (<i>Second voice</i>)[Verse: A & <i>B</i>]
A <i>(Second voice)</i>The fix
In the workbench this finding carries one control, labelled Include parentheses in performer formatting. The fix is classified as safe, so pressing it applies the edit directly — one press, one undo step.
Source
The guideline this rule enforces, as cited on every finding it reports:
Use song part headers verified Section headers, performer legends, and four differentiation styles