Verified answer

you can order online from sharmusic.com or even just from amazon.

buying real editions really is better. but if you want to check out this music before you buy it to decide what to choose, most of what you listed is old enough to be in the public domain. so it is legally available for free at this site: http://imslp.org/wiki/

you can search for the specific composers there and their pages will have links to the sheet music, but also links to other websites about the composer with biographical information.

http://imslp.org/wiki/Category:Bach,_Johann_Sebast...

http://imslp.org/wiki/Category:Chopin,_Fr%C3%A9d%C...

http://imslp.org/wiki/Category:Hummel,_Johann_Nepo...

you can also just search for "piano exercises" to get a list like this

http://www.google.com/search?hl=en&q=site:imslp.or...

or studies http://www.google.com/search?q=site%3Aimslp.org+pi...

or etudes http://www.google.com/search?q=site%3Aimslp.org+pi...

or people make lists there like this:

http://imslp.org/wiki/List_of_Piano_%C3%89tudes

or you can assign categories to search, like "piano" and "methods"

http://imslp.org/index.php?title=Category:For_pian...

This is a great question. Getting started on learning about classical music is (fortunately) real simple... it requires a couple of things: First, an open mind. You need to start listening to works by the well known composers without preconceived notions of what to expect. Secondly, a couple of good books are a huge help. I recommend both a) The Essential Canon of Classical Music by David Dubal, and... b) The NPR Guide to building a Classical CD collection by Ted Libbey. Next - start acquiring CDs - compilations are good to start with. I recommend the "Essential" series on Decca, Essential Beethoven, Essential Mozart and Essential Bach should get you started. Once you have listened and read the aforementioned - you'll be off and running - and be able determine for yourself where to go from there. Good Luck.

Easy.

Willard Palmer's collection of master works by Alfred Publishers.

Go to the library of any music school or department. The librarian should be able to help you. Be nice to them though, coz if they don't feel like it they won't go through the trouble of looking for all of that stuff for you. haha

Austrian library

check stores like meeker and graner. also, jwpepper has a large selection of music, im just not sure about the particular composers you listed.

jwpepper.com