Loved hearing about how Demosthenes practiced in this talk by Eduardo Briceño.
Many musicians–especially school musicians who perform only once every few months–need almost the opposite approach from what Eduardo emphasizes at the beginning of this talk. As musicians, we need to perform more. It’s a secret to getting better that Nicholas Barron took full advantage of, as shared in The Practice of Practice.
Switching as much as possible between the performance and practice zones seems to be the key.