What are the best ways to building finger dexterity?I especially want to be able to do a 4-5 trill with both hands.There is a section in La Campanella where the trill is too much for me to handle because the thumb is playing at the same time, and I am trying to find some way around this.
I don't really know the piece extremely well, but a great piano student devises his own exercises to apply to his repertoire...