What do you consider the most beautiful piece(s) of classical music ever compose

Question:

Comments on why you chose the piece(s) will be appreciated.
I like the Andante Cantabile from Tchaikovski's 5th Symphony for it's gorgeous horn solo.

Best Answer - Chosen by Asker: The song "Diary of a Madman" by Ozzy Osbourne from the album "Diary of a Madman"