Nearly 100 musicians from around the world will be playing in New York's Carnegie Hall in a performance by the "YouTube Symphony Orchestra."
Mountain View-based Google held an online contest, in which users voted for their favorites from a group of 200 finalists.
The orchestra will be led by San Francisco Symphony conductor Michael Tilson Thomas.
Musicians range in age from 15 to 55.
YouTube is owned by Google, which is paying for their airfare and expenses.