why do you always ask the questions I can answer when i've left?? 
(one example of)
canticales are my bag - most usually in church services these days, it's the Venite, Exultemus, Benedicte,Jubilate, Te Deum, the Mangificat and Nunc Dimittis, etc.
the Jubilate and Te Deum are done in morning prayer (matins) and Mag and Nunc done in Evensong.
The Jubilate comes from psalm 100:
O be joyful in the Lord all ye lands,
serve the Lord with gladness and come before his presence with a song.
Be ye sure that the lord he is good, it is he who hath made us and not we ourselves.
We are his people and the sheep of his pasture.
O go your way into his gates with thanksgiving and into his courts with praise.
Be thankful unto him and speak good of his name, for the Lord is gracious, his mercy is everlasting, and his truth endureth from generation to generation.
the best setting to this is
they're all set out in the Book of Common prayer.
the magnificat is Mary's song, when the angel gabriel tells her she's going to have Jesus (mark1:46-55) - she says "my soul doth magnify the lord and my spirit hath rejoiced in God my Saviour, for he hath regarded his handmaiden. For behold from henceforth, all generatiosn shall call me blessed. For he that is mighty hath magnified me, and holy is His name. And his mercy is on them that fear him: throughout all generations. He hath shewed the strength of his arm, he hath scattered the proud in the imagination of their hearts. he hath put down the mighty from their seat and hath upholded the humble and meek. he hath filled the hungry with good things and the rich he hath sent empty away. He remembering his mercy hath holpen his servant Israel.As he promised to our forefathers, Abraham and his seed forever."
the Nunc Dimittis is when Jesus is presented to the temple and Simeon says:
"Lord, now lettest thou thy servant depart in peace, according to thy word. For mine eyes have seen thy salvation, which thou hast prepared before the face of all people. To be a light to lighten the Gentiles, and to be the glory of thy people Israel."
Basically, he's saying - what the prophets said, has coem true,which means my life's work is done, I've seen what we have all been waiting for, and i'm ready to die now (he was a very, very old man)