It rejected works that showed bright colors, unusual subjects, or any form of experimentation.

VOA: special.2009.07.12

So there are all sorts of different little technique things you can do to create different colors and sounds on all string instruments, so this applies to any of them.

在所有弦乐器中,都能用很多小技巧,来制造不同的音色和音质,这些技巧对任何弦乐器都适用

耶鲁公开课 - 聆听音乐课程节选