#1 principle of writing for organ instead of piano

Anytime you're writing a piece for choir piano, it can be tough to give the choir enough support. That's because the piano is a percussion instrument. As soon as you strike the keys, the sound diminishes. The only way to crescendo is to play MORE notes. That's why, some of the time, the best piano accompaniments for choir are quite active. But writing for the organ as the support instrument for a choir is VERY different. It's not a percussion instrument at all. In fact, it's kind of the...