What is YOUR most difficult piece to play?

On whichever instrument. It could be hard to play either technically or in terms of expression or both...

The six Sonatas and Partitas of Johann Sebastian Bach for solo Violin. One must have many years of long and hard practice to even attempt to play this. One can make a few flaws with Kreisler and Sarasate, and get away with it. But with Bach, one can hear right away. They are also very difficult to memorize and very few people appreciate all your hard work when you perform in public.

Master of Puppets on guitar... :]

Canon in D for violin. You need a lot of expression in the beginning and gets very techinial at the end. I've been working on the first page for a month. >.<

Definitely Rimski-Korsakov's Flight Of The Bumblebee. Very fast and very chromatic! A challenge for ANY instrument!

Sight-read piece :P
Not very big fan of performing music at sight!

One of the most difficult pieces to play on the piano...many famous pianists won't even attempt it b/c of it's extreme difficulty: the first piano etude bybGyorgy Ligeti entitled "Desordre". After the first 4 measures, he adds a note to a pattern in one of the hands and then the bar lines don't line up anymore...he continues to shake up the patterns in this way and it creates a fantastic poly-rhythmic adventure for the instrument...but it's a freakin' BEAST.

http://www.youtube.com/watch?v=qj9QlWltv...

I wouldn't ever even attempt to play that piece. For me, I find some of the Chopin etudes to be very difficult (at least to play well). Rach 3, of course, would be challenge. There are many difficult pieces in the piano repertoire....it's hard for me to say which would be MOST difficult other than the Ligeti.

Everyone I attempt.

Kumbaya.... is that classical music?

I find it hard to get all the emotion out of the piece, actually I find it hard to remember the chords :P

There are tons of difficult music for piano. Rachmaninoff Piano Concertos are a very good example. But for this answer I'd like to point you to the "Grand Galop Chromatique" by Franz Liszt.

You mean what the most difficult piece I can Play? I play piano, and the hardest piece I can play is Beethoven's 23rd Sonata.

Do you mean what I think is the hardest piece for Piano? Well, then, I'd Have to go with either Rachmaninoff's 4rd Piano Concerto or Liszts Apres Une Lecture du Dante.

Bach Double for violin.