Learn Gregorian Chant with ease and sing with the Pope.
The Church acknowledges Gregorian chant as specially suited to the Roman liturgy: therefore, other things being equal, it should be given pride of place in liturgical services.
(Sacrosanctum Concilium, 116)
With Cécile you'll learn how to sing Gregorian chant even if you can't sing at all.
You don't need to know any musical notation, just watch falling blocks and see in real time if you're singing in tune.