This was posted on our Community FB page a short time ago - thought that perhaps some here may not be aware of it. I've identified some of the languages - but not all
Follow it back toy YouTube,,,,,
" In this video troparion (short hymn presenting the essence of the feast/ saint day) is chanted by various choirs in: English (Byzantine chant), Church Slavonic (Byzantine chant), Greek, Arabic, Church Slavonic (Russian chant), Romanian, Spanish, Ukrainian, Albanian, Church Slavonic (Serbian chant), Georgian, French, Japanese, Swahili (Kiswahili; pictures also from Ethiopia), Arabic (quick melody), Indonesian, Church Slavonic (modern Bulgarian chant, Polish subtitles), English (modern arrangement). Most of them are with subtitles. "