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The A7 chord is the notes A, C#, E and G. The usual shape is an open chord: x 0 2 0 2 0, from the low E string to the high E. The guitar above is set up with A7 on the Q key: tap it or press Q to hear it, then strum the strings.
Numbers are fingers: 1 index to 4 little
The same chord, higher and brighter
Play it as 5 7 5 6 5 5, a barre at the 5th fret. Switch the guitar's chord level from Standard to Up to hear it.
These share a key with A7, so they sound right together, and they're on the pads next to it:
All the chords: guitar chord chart. Songs to practice them: easy guitar songs. Tune up first with the online guitar tuner.