25.32A1.

When selecting the title of a part of a musical work, follow 25.27A, 25.27B, and 25.28A, but not 25.29A.

25.32A2.

When the number of the part is used as an addition for the purpose of distinguishing between two or more parts with the same title, precede it by the English abbreviation "No." in all cases.

See also:

25.32. Parts of a Work