不就是升7降4吗? 厚厚,有那么简单吗,后生可畏,让新生代音乐家们来讲吧~!~
https://www.youtube.com/watch?v=e74UHwdzIfY
https://www.youtube.com/watch?v=Ae7o2pO_Kps
https://www.youtube.com/watch?v=M50rqM2g2fc