Film-composer Alan Silvestri has worked with Director Robert Zemeckis for many years. His latest soundtrack is for "The Polar Express," a famous Christmas book that the film's creators turned into a movie about a boy's belief in himself. The soundtrack has eight pieces by Silvestri and Glen Ballard. Some are grand and epic works, while others could be big band pieces or popular songs. The vocalists range from Josh Groban to Steven Tyler!