This work is written for two and three equal voices with organ or string instruments accompaniment. The original organ part was composed by Léo Delibes, the string version is by Boris Petrov.
Two versions of this short mass (Kyrie, Gloria, Sanctus, O salutaris Hostia, Agnus Dei) are available: one is with organ accompaniment, and the other is for string instruments accompaniment orchestrated by the Russian composer and concertist Boris Petrov.
The 3 mixed voices version by Pierre Calmelet can be also performed either with organ or with the string version.
This conductor is with 3 equal voices choir and strings but it can be used to perform the 3 mixed voices version with strings.
Instrumental nomenclature : violin1, violin2, alto, cello, double bass
Performing time : about 15 to 20 minutes