Catholic News Service has posted over the last couple of days a great series of videos about Gregorian chant and its place in the Church and the liturgy. Here is a particularly interesting one about the experience of St John the Beloved, a parish in McLean, Virginia, that decided to embrace chant as the normative music for all its Masses, exactly as Vatican II wanted. The parish, which has four different choirs, has successfully made chant an important part of the educational program at its school as well, and the music is embraced by the students.
And another about the nature of chant as prayer...
and how it elevates the worship of the Church.
You can find the rest of this excellent and useful series at the CNS Youtube channel.