Doubled leading tone in III · Rules
The exception to the previous rule: when the leading tone is the fifth of III, it may be doubled. It is allowed, but flagged so you know it is an exception.
- Doubled leading tone in III: The exception to the previous rule: when the leading tone is the fifth of III, it may be doubled. It is allowed, but flagged so you know it is an exception. (Piston, ch. 2, p. 16; ch. 3, p. 27)