吉他乐理课程
| Level | Title | Topic | ID |
| 怎样确定歌曲的音调？怎么辨别根音？ | 综合 | TH-06 | |
| 怎么区分大调和小调？ | 综合 | TH-14 | |
| 为什么吉他要用四度调音法？ | 综合 | TH-07 | |
| 大调音阶和弦的功能：和弦有什么功能 | 综合 | TH-09 | |
| 基本乐理知识小测试 | 测验 | TH-08 | |
| 中级乐理小测试 | 测验 | TH-15 | |
| 大调音阶里的和弦 | 综合 | TH-10 | |
| 和声走向：为什么和弦的顺序很重要？ | 综合 | TH-11 | |
| 音程, 和声的基础 | 综合 | TH-12 | |
| Rhythm Notation(节奏记谱法)的简介 | 综合 | TH-01 | |
| Pitch Notation（音高记谱法）的简介 | 综合 | TH-02 | |
| 学习五度圈 | 综合 | TH-13 | |
| 乐理的基础知识 | 综合 | TH-03 | |
| 大调音阶式 | 综合 | TH-05 | |
| 基本音符的介绍 | 综合 | TH-04 |
As the creator of Hub Guitar, Grey has compiled hundreds of guitar lessons, written several books, and filmed hundreds of video lessons. He teaches private lessons in his Boston studio, as well as via video chat through TakeLessons.