Addendum

For those of you who want to geek out on the nitty-gritty, here are the instruments/singers involved in ARCO:

Instruments:

14 Violins
5 Violas
4 Celli
3 Basses
3 Flutes/Piccolos
3 Oboes/1 English Horn
3 Clarinets/1 Bass Clarinet
3 Bassoons
4 Horns
3 Trumpets
2 Tenor Trombones
1 Bass Trombone
1 Tuba
2 Percussionists, playing all sorts of interesting instruments (10-gallon water jugs, anyone?)
2 Laptops
1 Harp
2 Pianos
1 Celesta

Singers:

1 Soprano (Bora Yoon)
1 Bass-Baritone (Charles Perry Sprawls)
New York Polyphony (early music quartet)

And...a partridge in a pear tree. I think that's it.