* The Tsar's Bride 174—Sopr. and Mezzo-sopr.
* Tsar Saltan 5-6—Sopr. and Mezzo-sopr.
In the case of voices related in twelfths:
| 12 | [ | Sopr. |
| Bass, |
intervals approaching one another do not create a good effect, for this transplants the deeper voice into the upper register and vice versa. Singing in unison is no longer possible, and thirds are to be avoided; the use of sixths, tenths and thirteenths is recommended. The voices will often be separated by more than a twelfth and crossing of parts is out of the question.
Example:
* Tsar Saltan 254-255.
Relationship in tenths
| 10 | [ | Sopr. | or | M.-sopr. |
| Bar. | Bass |
is fairly common. The explanations given above are also applicable in this case.