Index finger (1): press flat across the D string to the high E string at the 2th fret, a barre.
Ring finger (3): 4th fret of the G string.
Little finger (4): 4th fret of the high E string.
Let ring open: A string.
Don't play: low E string.
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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 Amaj9 chord
A major ninth is built from 5 notes: A (1), C♯ (3), E (5), G♯ (7), B (9). The lowest note you play should be the root, A, highlighted on the diagram. Above you will find 12 shapes for it across the neck. Learn the first one, then use the others to keep your hand close to the next chord in the song.