【問題】about 4 circle

For some reasons I can't type in Chinese, but please answer me in Chinese.

I'd like to know all about the 4 circle and how it applies. thanks!!

享受彈琴樂趣不是夢! 在本站團購 YAMAHA、Roland、Casio 電鋼琴，站長為您爭取最低價!

For some reasons I can't type in Chinese, but please answer me in Chinese.

I'd like to know all about the 4 circle and how it applies. thanks!!

不知道你指的是不是Circle of fourths？

幫你解答了
viewtopic.php?f=48&t=23385

不懂的話可以再問