LL at NLM posted this video clip of Balulalow from Benjamin Britten's A Ceremony of Carols. This brings back memories of my junior year in high school - just days before Christmas 1980 - when the chorus I sang in went to New York City to sing A Ceremony of Carols, joined by a New York dance troupe. That same troupe came to Rhode Island to join us.
The choir here is from St. Paul's Cathedral in London, England.
My top three personal favorites from the Britten work:
1. Wolcum Yole
2. As Dew in Aprile
3. Deo Gratias