《梦溪笔谈·乐律一》
函钟一变为太蔟，再变为南吕，三变为姑洗，四变为应钟，五变为蕤宾，六变为太吕，七变为夷则，八变为夹钟。
函钟一变为太蔟，再变为南吕，三变姑洗，四变应钟，五变蕤宾，六变太吕，七变夷则，八变夹钟也。
When the Hanzhong mutates once, it becomes Taicong; when it mutates again, it becomes Nanyue; when it mutates three times, it becomes Guxi; when it mutates four times, it becomes Yingzhong; when it mutates five times, it becomes Ruibin; when it mutates six times, it becomes Daiyu; when it mutates seven times, it becomes Yize; when it mutates eight times, it becomes Jiazhong.