My Dad introduced me to the music of Alexander Scriabin a little while back and I did some research into him. He wrote beautiful pianowerks, and I would recommend you listen to him. Look especially for stuff recorded by Roberto Szidon, as it is the best.
Some of his stuff is often regarded as unplayable, with a only small amount of people in the world actually capable of playing it. Scriabin himself injured his hands so badly trying to play his music that he rendered himself incapable.
Read this to find out what was really 'experimental' about him. All I've got to say is, the guy was ****ing nuts.