MUST-KNOW UKULELE CHORDS FOR BEGINNERS Chord charts in Standard Tuning (GCEA) © 2011-2018 ukulele-chords.com Version 2.1.1611.18 How to read a chord chart? A chord diagram consists of 4-6 horizontal lines, and 4 vertical lines. Vertical lines represent the four strings of the ukulele, and horizontal lines are the frets.