How To Play Any Song With 4 Chords (Step-By-Step Guide)
Amazon.co.jp: 4-Chord Worship Songs for Guitar: Play 25 Worship Songs with Four Chords: G-C-D-Em (GUITARE) (English Edition) 電子書籍: Hal Leonard Corp.: 洋書
Four chords every beginning guitar player should know and songs that go with them | Jamiebobamie
Free Download - Guitar Chord Image Library | Midnight Music