Tchaikovsky: http://en.m.wikipedia.org/wiki/Pyotr_Ilyich_Tchaikovsky
The Nutcracker: http://en.m.wikipedia.org/wiki/The_Nutcracker
The Auditorium Theatre: http://en.m.wikipedia.org/wiki/Auditorium_Theater
Joffrey Ballet: http://en.m.wikipedia.org/wiki/Joffrey_Ballet