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Below is a chord construction formula for some of the commonly used chords in 8 of the most common keys.
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Chords for keys not listed here can be constructed by applying the correct formula to the respective scale. Let's construct a B7 chord:

B7 is based on the Dom 7 formula, which is 1-3-5-b7, so start by spelling the B major scale and pick out the notes according to the formula:

B - C# - D# - E - F# - G# - A#
1   2      3     4    5     6      7

and we get this:

B - D# - F# - A  =  B7
1   3      5     b7

*When dealing with chords that needed more than 4 notes to make up the chord, the 5th can always be omitted*

Knowing the formula for chords constructions is a great benefit to improve as a musician. The coolest thing is, you don't have to relay on chord books now that you can invent your own chord fingerings..:)

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Great book that covers essential concepts for players of every level, acoustic or electric. It's a hands-on guide to theory that teaches you how to build any scale or chord on your own and unleash creativity. No music reading is required.
  Key    | Minor    | Minor 7     | Minor 9       | minor 7b5  | Diminished  |
      
  | 1-b3-5   | 1-b3-5-b7   | 1-b3-5-b7-9   | 1-b3-b5-b7 | 1-b3-b5-bb7 |

C Major  | C-Eb-G   | C-Eb-G-Bb   | C-Eb-G-Bb-D   | C-Eb-Gb-Bb | C-Eb-Gb-A   |

G Major  | G-Bb-D   | G-Bb-D-F    | G-Bb-D-F-A    | G-Bb-Db-F  | G-Bb-Db-E   |

D Major  | D-F-A    | D-F-A-C     | D-F-A-C-E     | D-F-Ab-C   | D-F-Ab-B    |

A Major  | A-C-E    | A-C-E-G     | A-C-E-G-B     | A-C-Eb-G   | A-C-Eb-Gb   |

E Major  | E-G-B    | E-G-B-D     | E-G-B-D-F#    | E-G-Bb-D   | E-G-Bb-Db   |

F Major  | F-Ab-C   | F-Ab-C-Eb   | F-Ab-C-Eb-G   | F-Ab-B-Eb  | F-Ab-B-D    |

Bb Major | Bb-Db-F  | Bb-Db-F-Ab  | Bb-Db-F-Ab-C  | Bb-Db-E-Ab | Bb-Db-E-G   |

Eb Major | Eb-Gb-Bb | Eb-Gb-Bb-Db | Eb-Gb-Bb-Db-F | Eb-Gb-A-Db | Eb-Gb-A-C   |
  Key    | Major   | Maj 7     | Dom 7      | add 9     | sus      | Aug     |
      
  | 1-3-5   | 1-3-5-7   | 1-3-5-b7   | 1-3-5-9   | 1-4-5    | 1-3-#5  |

C Major  | C-E-G   | C-E-G-B   | C-E-G-Bb   | C-E-G-D   | C-F-G    | C-E-G#  |

G Major  | G-B-D   | G-B-D-F#  | G-B-D-F    | G-B-D-A   | G-C-D    | G-B-D#  |

D Major  | D-F#-A  | D-F#-A-C# | D-F#-A-C   | D-F#-A-E  | D-G-A    | D-F#-A# |

A Major  | A-C#-E  | A-C#-E-G# | A-C#-E-G   | A-C#-E-B  | A-D-E    | A-C#-F  |

E Major  | E-G#-B  | E-G#-B-D# | E-G#-B-D   | E-G#-B-F# | E-A-B    | E-G#-C  |

F Major  | F-A-C   | F-A-C-E   | F-A-C-Eb   | F-A-C-G   | F-Bb-C   | F-A-C#  |

Bb Major | Bb-D-F  | Bb-D-F-A  | Bb-D-F-Ab  | Bb-D-F-C  | Bb-Eb-F  | Bb-D-F# |

Eb Major | Eb-G-Bb | Eb-G-Bb-D | Eb-G-Bb-Db | Eb-G-Bb-F | Eb-Ab-Bb | Eb-G-B  |