Later, someone from the Sacramento Choral Society says, "I think that people were happy to have the chance to sing the Hallelujah Chorus...We did it outside. It was a glorious experience. We must disperse this crowd now. This is really quite out of control."

On the Sacramento Bee site, there's quite a lively debate going on as to the wisdom of organizing the event (not to mention side arguments about separation of church and state).

Here's raw video of the incident from the LA Times blog. And here's a KCBS Sacramento video report. More local news videos here, here, and here.

One of the more interesting articles I've read about flash mobs was this one, from Harper's in 2006, written by someone who claims to have invented the phenomenon out of boredom.

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Roseville Galleria Mall Flash Mob Gets Out of Control