key stands for key

, which is usually used in notation.

indicate the tune below the rhythm.

For example, KEY=D is a tune in D

But some people usually understand KEY as a degree, and musicians in Taiwan Province usually do this

For example, we usually call it two degrees for the distance from roll call 5 to 7

If we are professional, we should also explain the interval relationship, which is called sophomore

. However, Taiwan Province area or pop singers usually have two KEYs higher than 5, so I may be unprofessional

. But this name is easier to understand in the first KEY

There is no doubt that key stands for key. KEY= key