Quiz: How well do you know Gustav Holst's 'The Planets'?

Ines Guanchez, Randy Salas  - 
The planets in our solar system. NASA/JPL

Gustav Holst's The Planets celebrates its 100th anniversary this month, with its first complete public performance on Sept. 29, 1918. But how much do you know about this popular orchestral work? Take our quiz to find out!