California dreaming…when John Adams composed his Harmonielehre, he imagined he saw a giant oil tanker lifting out of San Francisco Bay and taking off like a rocket. Danny Elfman, meanwhile…well, what more can you say about the composer who created the musical worlds of Batman, The Simpsons and Edward Scissorhands? Put them together with the 164 teenage virtuosos of the National Youth Orchestra of Great Britain and the energy will raise the roof.