If you've read the tutorial covering the theory behind the natural minor scale and the basics of chord contruction, then you should find the following easy enough to understand.
The table below shows the triads contained in all the natural major keys. There's no substitute for knowing the theory behind this, and being able to work it all out for yourself, so please don't just try to learn all of these parrot-fashion. Really, I've included it here so that if you want to try and work out triads for a major scale, you can use this table to check if you've got it right.
i | Am | A - C - E |
iio | Bo | B - D - F |
III | C | C - E - G |
iv | Dm | D - F - A |
v | Em | E - G - B |
VI | F | F - A - C |
VII | G | G - B - D |
i | Em | E - G - B |
iio | F#o | F# - A - C |
III | G | G - B - D |
iv | Am | A - C - E |
v | Bm | B - D - F# |
VI | C | C - E - G |
VII | D | D - F# - A |
i | Bm | B - D - F# |
iio | C#o | C# - E - G |
III | D | D - F# - A |
iv | Em | E - G - B |
v | F#m | F# - A - C# |
VI | G | G - B - D |
VII | A | A - C# - E |
i | F#m | F# - A - C# |
iio | G#o | G# - B - D |
III | A | A - C# - E |
iv | Bm | B - D - F# |
v | C#m | C# - E - G# |
VI | D | D - F# - A |
VII | E | E - G# - B |
i | C#m | C# - E - G# |
iio | D#o | D# - F# - A |
III | E | E - G# - B |
iv | F#m | F# - A - C# |
v | G#m | G# - B - D# |
VI | A | A - C# - E |
VII | B | B - D# - F# |
i | G#m | G# - B - D# |
iio | A#o | A# - C# - E |
III | B | B - D# - F# |
iv | C#m | C# - E - G# |
v | D#m | D# - F# - A# |
VI | E | E - G# - B |
VII | F# | F# - A# - C# |
i | D#m | D# - F# - A# |
iio | E#o | E# - G# - B |
III | F# | F# - A# - C# |
iv | G#m | G# - B - D# |
v | A#m | A# - C# - E# |
VI | B | B - D# - F# |
VII | C# | C# - E# - G# |
i | A#m | A# - C# - E# |
iio | B#o | B# - D# - F# |
III | C# | C# - E# - G# |
iv | D#m | D# - F# - A# |
v | E#m | E# - G# - B# |
VI | F# | F# - A# - C# |
VII | G# | G# - B# - D# |
i | Ebm | Eb - Gb - Bb |
iio | Fo | F - Ab - Cb |
III | Gb | Gb - Bb - Db |
iv | Abm | Ab - Cb - Eb |
v | Bbm | Bb - Db - F |
VI | Cb | Cb - Eb - Gb |
VII | Db | Db - F - Ab |
i | Bbm | Bb - Db - F |
iio | Co | C - Eb - Gb |
III | Db | Db - F - Ab |
iv | Ebm | Eb - Gb - Bb |
v | Fm | F - Ab - C |
VI | Gb | Gb - Bb - Db |
VII | Ab | Ab - C - Eb |
i | Fm | F - Ab - C |
iio | Go | G - Bb - Db |
III | Ab | Ab - C - Eb |
iv | Bbm | Bb - Db - F |
v | Cm | C - Eb - G |
VI | Db | Db - F - Ab |
VII | Eb | Eb - G - Bb |
i | Cm | C - Eb - G |
iio | Do | D - F - Ab |
III | Eb | Eb - G - Bb |
iv | Fm | F - Ab - C |
v | Gm | G - Bb - D |
VI | Ab | Ab - C - Eb |
VII | Bb | Bb - D - F |
i | Gm | G - Bb - D |
iio | Ao | A - C - Eb |
III | Bb | Bb - D - F |
iv | Cm | C - Eb - G |
v | Dm | D - F - A |
VI | Eb | Eb - G - Bb |
VII | F | F - A - C |
i | Dm | D - F - A |
iio | Eo | E - G - Bb |
III | F | F - A - C |
iv | Gm | G - Bb - D |
v | Am | A - C - E |
VI | Bb | Bb - D - F |
VII | C | C - E - G |
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