Let ring open: D string, G string, B string, high E string.
Don't play: low E string.
x30000 · Cmaj9 shape
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Strumming patterns to try
↓↓↓↓Four downsSteady, for learning changes
↓↓↑↑↓↑Folk / popThe everyday pattern
↓↓↑↓↑BalladSlow songs, 3/4 or 6/8
↑↑↑↑Reggae skankOff-beat chops
About the Cmaj9 chord
C major ninth is built from 5 notes: C (1), E (3), G (5), B (7), D (9). The lowest note you play should be the root, C, highlighted on the diagram. There are 12 ways to play it above, from the open position up the neck: start with the first, then pick whichever is closest to the chord you play before and after it.