The most popular Orchestra that I know is David Foster Orchestra.. He is the one of the greatest musician in the world.. He has held on concert in many countries.. and all of his concert are success ! Wow ! what a blast concert ! He also invites popular singers in the world in his concert .. and he presents 20 songs in each of his concert.. You should watch ! He always play the piano to lead his orchestra with full of expressions and powerful spirit of music , he also enjoy in his concert without nervous.. he helped Celine Dion to learn English and to be the greatest singer in the world