YouTube has narrowed down finalists for its second YouTube Symphony Orchestra 2011 to be held at the Sydney Opera House and is calling on users to vote on the best musicians.

Users can vote on the remaining 336 finalist from 46 countries over the next seven days to determine who will be going to the Sydney Opera House from March 14-20 to perform for a global audience.

The YouTube Blog offers more details. “You can vote once per video, per day, until 23:59 EST on December 17 to help YouTube Symphony Orchestra Artistic Advisor Michael Tilson Thomas boil the 300 shortlisted hopefuls down to the final 96.”

“Your votes are also needed to help choose four solo improvisers. ‘Mothership’ composer Mason Bates will be using your input to choose from 36 soloists, including show-stopping performances on instruments like the guzheng, the musical saw and… the udderbot.”