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|A 13 chord intervals and notes|
|Intervals||1 - 3 - 5 - b7 - 9 - (11) - 13|
|Notes in A 13||A - C# (Db) - E - G - B - D - F# (Gb)|
13th chords are formed by adding a 13th (6th) interval note to a dominant 11th chord, so adding the 13 to 1 - 2(9) - 3 - 4(11) - 5 - b7) to form 1 - 2(9) - 3 - 4 - 5 - 6(13) - b7. Notice that this results in 7 notes, but only 6 strings on the guitar, meaning at least one of the notes needs to be emited. The most important degrees in this chord are 1 3 6(13) b7, and in general the first note you would leave out is the 11th (4th).
Here are 6 voicings of the A13 guitar chord, with a chord chart to each voicings' fingering.
You can practice changing between chords in your head when you are at the office, on the train, or wherever. This may sound silly, but it really helps remember those chords.
Keep your hand loose, rather than stiff and hard. A loose hand is essential for playing chords and switching between them.