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Inter Sollicitudines (Italiane Tra le sollicitudine) est epistola apostolica papae Pii X ut Motu Proprio die 22 Novembris (festo Sanctae Caeciliae) anno 1903 promulgata pro refectionem cantuum gregorianorum magnorumque operum musicalium latinorum. Fuit cum compositore Presbytero Laurentio Perosi coscriptus.
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