最近想编我自己的吉他教案，得加把劲把脑海里的资料整理出来，大家为我打气吧！
Introduction
I believe you've got some idea about INTERVAL on my last tutorial (see here), now you know how to construct some fancy pattern boombastic chord using the formula provided once you set the root
note. In this tutorial, we will talk about the relationship between interval and chord progression.
This session is trying to help you to understand the colour and feeling of a chord when it appears in certain timing of a song. This idea also helps you to train your relative pitch!! (Discussion about Perfect Pitch and Relative Pitch see here, but don't click yet, I haven't compose that, hahaha)
相信看完之前那一篇的朋友对音程度数已经有一些概念了。现在我们已经可以在定出根音后用音程度数的概念来编出和弦了，今天我们就来讨论音程度数和和弦进行之间的关系。希望这篇文章能帮助大家了解和弦在歌曲中出现时他所带有的色彩和感觉。使用音程度数的概念来扒曲子能训练你的相对音感哦！
What is Chord Progression?
Explain in the most simple way word and method, chord progression is the route that chord appear in a song.
We already know to set the root to find the interval, today, we are going to start by setting the root first too, but some idea is different:
- the root of finding a chord will be the "bass note" of that chord (of course we start with the lowest tone),
- the root of understanding chord progression will be the playing key, or I just simply call it the Root Chord here, ex: in C key, the root will be C Major chord; in E key, the root will be E Major chord.
Let's see this graph (see figure 1), I put in the most common chord to be use in recent pop songs.
什么是和弦进行？用最简单的方式来讲，就是和弦进行的方式，简单明了易懂吧？
我们已经知道要开始使用音程度数时得知道你的根音在哪里，今天我们也得先定好我们的根音，但有些概念时和建构和弦时不一样的：
- 建构和弦时的根音指的是找出和弦中最低的音。
- 找出和弦进行时所谓的根音指的是曲调中的第一个和弦，或者说是根和弦（注：这只是为方便大家了解提出的一个概念，并不是专业术语），如C调的根就是C大调和弦；E调的根就是E大调和弦。
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| figure 1 |
