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|C 13 chord intervals and notes|
|Intervals||1 - 3 - 5 - b7 - 9 - (11) - 13|
|Notes in C 13||C - E - G - A# (Bb) - D - F - A|
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 C13 guitar chord, with a chord chart to each voicings' fingering.
When changing chords, visualize the chord you are about to change to, it really helps nail that chord change.
Keep your hand loose, rather than stiff and hard. A loose hand is essential for playing chords and switching between them.