Legend of Kitesh 167, 177-178.
The Golden Cockerel 237-238, 262-264.
The reader will find instances of choral accompaniment in many examples relating to other sections of the work.
In the case of solitary exclamations or phrases in recitative, melodic doubling is not always suitable. It is better to support the voice simply by harmonic duplication.
The repetition of notes—required by declamation—forming no fundamental part of the rhythmical structure of a phrase or chord should not be reproduced in the orchestra; the melodic or harmonic basis alone should be doubled. Sometimes the rhythmical structure of a choral phrase is simplified in comparison with its orchestral duplication.
Examples:
[No. 293.] The Tsar's Bride 96.
[No. 294.] Ivan the Terrible, Act I, before 75.
Choral passages, the musical context of which is complete in itself, forming a chorus a cappella often remain undoubled by the orchestra, accompanied solely by sustained notes or an independent polyphonic figure.
Examples: