Beautiful. It should be noted that the hymn is borrowing from St. John Chrysostom's
It is truly meet and right to bless you, O Theotokos,
Ever-blessed and most-pure mother of our God.
More honourable than the Cherubim,
And beyond compare more glorious than the Seraphim,
Who without corruption gave birth to God the Word,
True Theotokos: we magnify you
It is truly meet and right to bless you, O Theotokos, Ever-blessed and most-pure mother of our God. More honourable than the Cherubim, And beyond compare more glorious than the Seraphim, Who without corruption gave birth to God the Word, True Theotokos: we magnify you"
Yes, from the Divine Liturgy. This is the famous Theotokion called "Axion Estin" which we chant every Sunday just after the consecration.
http://www.youtube.com/watch?v=PEHJY0T9RsQ&feature=related