It's "Sanctus" from the Missa Luba, a version of Latin Mass, sung in African style by Congolese children.
It features prominently in one of my favourite films "If..." , and I think was a hit in the 50s or 60s in the UK.
Anyway, it's very strange and haunting, and succinct, and religious, and has a mental last 20 seconds - the perfect thing for Sunday Morning.
