Beethoven's 5th Symphony, Rossini's William Tell Overture, and Tchaikovsky's 1812 Overture

In my mind, these are probably three of the most known and identifiable pieces of classical music that exist.

The 4 opening notes of Beethoven's 5th http://en.wikipedia.org/wiki/Symphony_No._5_(Beethoven) are amazing.  They symbolize the letter V in Morse Code, and the letter V in Roman Numerals is the symbol for the letter 5. The notes are repeated throughout the piece.  They are so simple, but so profound. I cannot express the emotion that wells up within me when I hear this piece of music.  Beethoven was such a genius.

Rossini's William Tell Overture http://en.wikipedia.org/wiki/William_Tell_Overture received a commercial and recognition boost when it was used for the theme music for The Lone Ranger. I suspect most people who are familiar with this piece do not know the classical origin, but I could be wrong.

Tchaikovsky's 1812 Overture http://en.wikipedia.org/wiki/1812_Overture is beyond amazing. I cannot tell you what emotions well up within when I hear this piece.  There are such sequences that amaze, enthrall and just overwhelm me.  There are sequences that suggest fireworks, and expansiveness and overwhelmingness. It is a piece that for me, excels beyond greatness.