if u go 2 sheetmusicplus.com they can give u some pretty chalenging stuff. try lookin 4 that song (largo) by bach. it plays it 4 ya, but u hav 2 order that sheet music, its cheap though. iv been playin 4 yrs. any1 else been playin that long?¿

Hehe, try playing Liszt`s "Mephisto Waltz"... That has GOT to be the hardest thing ever.

Try Beethoven`s "Hammerklavier" Sonata, or some of the harder Chopin Etudes. You can find the etudes by just searching `free sheet music Chopin etude` on google or on one of the sites listed at http://www.findfreesheetmusic.com/pages/Piano/
For the Beethoven sonata... I suggest you just go the whole way and buy all 32 sonatas in one collectors edition - they`re great at all levels and standard concert pieces.

Good Luck!

~robert quiller

HEY!!! i agree with robert quiller... but it depends on what kind of difficult you wanna work!!!... lets say some i know...
ok TECHNICALLY: RAVEL: Gaspard dela Nuit... thats good!!!
BALAKIREV: Yslamey... GOD thats one!!!
Liszt Music isnt easy at all thats right try campanella or the rhapsodies Hongroises... liszt paganini etudes... Funerailles!!! good!
there is too many!!! to name... ahhh messiaens etudes!!! rachmaninoff etudes... those are very difficult!!!...

ok we have to start that everything i named should be worked musically too in order to do a good interpretation.... but seruisly... these pieces wont bore anyone!!!

ok musically... beethoven sonatas are very dificul... like hammerklavier and the last one... the appasionata...
brahms music like concertos sonatas rhapsodies and so on... chopin music.... ballades.. etudes... concert... barcarolla... you have a HUGE library to choose on!!! good luck!!! i hope i can play with that ease those pieces... ahhh you know wich one!!! Galope Chromatique!!!... thats a good one!!! and i know of a piece for piano... the composer... ehhh.... ok Iannis Xenakis... you have a pentagram for each finger... i mean... NO WAY!!!! tooo much finger independence... maybe bach could easily play it... bye!