After holding auditions in December and announcing the finalists last month, the YouTube Symphony Orchestra has now released the first product of its efforts. Tonight, the 90 members of the orchestra will perform live at New York's Carnegie Hall, but this morning, the project released a mash-up video that features all the finalists, who perform the world premiere of a specially commissioned piece by Tan Dun.

For this project, Google received close to 3,000 submissions from musicians all over the world, and the finalists come from over 30 countries, six continents, and play 26 different instruments. Google invited all the finalists to come to New York, where they have been preparing for tonight's performance at Carnegie Hall under the direction of Michael Tilson Thomas, the Music Director of the San Francisco Symphony. Video from tonight's event should be available on YouTube tomorrow.

You can also watch videos from a few of the participating musicians, as well as other videos from the auditions and practice sessions in New York on the custom YouTube Symphony channel.

And now for something completely different...

Of course, if classical music isn't quite your thing, you can also check out these brilliant remixes from Kutiman, who takes the whole YouTube mash-up concept to a different level.