Verified answer

Start here!

http://www.kickassclassical.com/

A good start could be:

Holst: The Planets

Mozart: Symphony No 41, Coronation Mass

Vivaldi: The Four Seasons

Bach: The Brandenberg Concertos.

Mozart : Symphony No. 40 , Ein Kline Nach Music

Beethoven : Symphony No. 5 , Moonlight Sonata

Chopin : Waltzes.

Bach : Violin Concertos.

J.Strauss II : Waltzes , Polkas ..... etc.

The below link to "Wikipedia", provides a complete, comprehensive list of all classical music composers; and you can follow other links listing all of their compositions:

http://en.wikipedia.org/wiki/Classical_composers

Alberich

I'd start with Beethoven, Mozart, and Bach. Cliche but they are not famous for nothing.

Bach - Toccata & Fugue in D Minor

Beethoven - Moonlight Sonata

Beethoven - Fur Elise

Bach - Bouree In E Minor

These are 4 very good pieces that im sure you have heard at some point or another in your life. :D