On Practice: Chord Spelling
By Daniel Roest

Here is a handy reference chart for chords. Everything is based on a C Major scale and can be applied to all other keys. As you may know, the C scale is C-D-E-F-G-A B-C and follows the sequence of intervals (distances) of  Whole Step, Whole Step, Half Step, Whole Step, Whole Step, Whole Step, Half Step. As you also may know, a half step is one fret, a whole step is two frets. The last thing to know before looking at the chart is that each scale tone gets a number, in order. So, 1-2-3-4-5-6-7-8 is C-D-E-F-G-A-B-C. And you can keep going beyond the octave with 9 (D), 11 (F), 13 (A).
Here's the chart:

I1, 3, 5 CC, E, G
I 7            1, 3, 5, b7   C7     C, E, G, Bb
I 9     1, 3, 5, b7, 9      C9     C, E, G, Bb, D
I 6     1, 3, 5, 6     C6     C. E. G. A
I 13   1. 3. 5. b7, 9, 13C13    C, E, G, Bb, D, A
I 7b5 1, 3, b5, b7C7b5   C, E, Gb, Bb
I 7b9 1, 3, 5, b7, b9    C7b9  C, E, G, Bb, Db
I 7b5b9    1, 3, b5, b7, b9   C7b7b9     C, E, Gb, Bb, Db
I maj7      1, 3, 5, 7      Cmaj7C, E, G, B
I maj9      1, 3, 5, 7, 9  Cmaj9C, E, G, B, D
I add9      1, 3, 5, 9      Cadd9C, E, G, D
I 6/9 (15)  1, 3, 5, 6, 9 C6/9 (15)   C, E, G, A, D
I sus4 (11)1, 4, 5  Csus4 (11) C, F, G
I 7sus4     1, 4, 5, b7    C7sus4       C, F, G, Bb
I 13b9      1, 3, 5, b7, b9, b3       C13b9C, E, G, Bb, Db, A
I +     1, 3, #5C+      C, E, G#
I 7+   1, 3, #5C7+    C, E, G#, Bb
I 7+9 1, 3, 5, b7, #9     C7+9  C, E, G, Bb, D#
I 9+   1. 3, #5, b7, 9     C9+    C, E, G#, Bb, D
I +11 1, 3, 5, b7, 9, #4 (#11)       C+11  C, E, G, Bb, D, F# 

i  1, b3, 5Cm      C, Eb, G
i 7      1, b3, 5, b7  Cm7    C, Eb, G, Bb
i 9      1, b3, 5, b7, 9      Cm7   C, Eb, G, Bb, D
i 7b5         1, b3, b5, b7 Cm7b5       C, Eb, Gb, Bb
i 7b9                1, b3, 5, b7   Cm7b9       C, Eb, G, Bb, Db
i 7b5b9            1, b3, b5, b7 Cm7b5b9           C, Eb, Gb, Bb, Db
i 6     1, b3, 5, 6      Cm6   C, Eb, G, A
i 6/9  1, b3, 5, 6, 9  Cm6/9C, Eb, G, A, D
i (maj7)     1, b3, 5, 7      Cm(maj7)  C, Eb. G. B
i o      1, b3, b5Co      C, Eb, Gb
i o7    1, b3, b5, bb7Co7   C, Eb, Gb, Bbb
i o9    1, b3, b5, bb7, 9    Co9   C, Eb, Gb, Bbb, D






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