Many thanks to Ewan McIntosh for flagging this up – Eric Whitacre‘s Virtual Choir singing Lux Aurumque (Light and Gold)  – a beautiful blend of music and technology:

[kml_flashembed movie="http://www.youtube.com/v/D7o7BrlbaDs?rel=0" width="425" height="350" wmode="transparent" /]

The idea and its history is explained here:[kml_flashembed movie="http://www.youtube.com/v/zyLX2cke-Lw?rel=0" width="425" height="350" wmode="transparent" /]

I found the following translation of the text of Lux Aurumque here:

Lux

Calida gravisque

Pura velut aurum

Et canunt angeli

Molliter modo natum

Light

Warm and heavy

As pure gold

And the angels sing softly

To the newborn babe

The following related videos might also be of interest:

Singing instruction (although this is for another work – Sleep):[kml_flashembed movie="http://www.youtube.com/v/dWCTKnbqE6s?rel=0" width="425" height="350" wmode="transparent" /]

Recording instruction:[kml_flashembed movie="http://www.youtube.com/v/IrQRVI8y5j8?rel=0" width="425" height="350" wmode="transparent" /]

Conducting track (instruction first and then real time conducting kicks in at 5:18)[kml_flashembed movie="http://www.youtube.com/v/uh1c2xWVWiA?rel=0" width="425" height="350" wmode="transparent" /]

Score of Lux Aurumque (moves along with music)[kml_flashembed movie="http://www.youtube.com/v/aLBKyLT-j4w?rel=0" width="425" height="350" wmode="transparent" /]