Anybody who starts by saying "Choirs are my passion and have been all my life" gets my immediate approving attention.
I greatly admire Gareth Malone's work popularising choral music and really enjoyed watching this superb documentary from the Beeb's about "how choirs work" presented by him .
In it Malone presents a lot of information about choirs and choral singing, conducting, and composing with clarity, affection, and respect. I've uploaded this for educational purposes but don't let the word "educational" put you off, this is no dull and worthy documentary it's fresh, vivid, and very enjoyable - much like a choir's singing after Malone has got his hands on them in fact. Enjoy :-)
Channel: Education Channel