You can always go back to Bach...the Two and Three Part Inventions, the French Suites. I think they've done wonders for my technique. "It seems almost foolish to repeat what has been said so many times about the wonderful old cantor of Leipsic, Johann Sebastian Bach. However, there may still be some who have not yet become acquainted with the indisputable fact that the practice of Bach is the shortest, quickest road to technical finish."...Wilhelm Bachaus in Great Pianists on Piano Playing by James Francis Cooke.