Here is transcriptions and original works published by Klarthe.
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Sheet music
Nadir - Matthieu Stefanelli
Opéra-Conte pour choeur d'enfants à 3 voix égales, 5 récitants et orchestre d'harmonie
Missa Brevis 2021 - Olivier dos Santos
For soprano, mezzo-soprano, tenor, baritone, large choir and organ