It also uses the second theme from the second movement of Tchaikovsky 's String Quartet No. 1 .
The song takes its melody from Pyotr Ilyich Tchaikovsky 's Swan Lake ballet .
It also uses the second theme from the second movement of Pyotr Ilyich Tchaikovsky 's String Quartet No. 1 .
The song takes its melody from Pyotr Ilyich Tchaikovsky 's Swan Lake ballet .