video in AudioSet
A list of about a million ten-second YouTube clips, each labelled with the sounds in it, that Google published in 2017. Labs use it to train and test general audio and music models.
Including Ύμνοι στην Αγία Τριάδα, ψάλλει ο χορός μοναζουσών της Ιεράς Μονής Αγίου Στεφάνου, Μετεώρων