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Hi All

Just joined the forum, had a look around and it seems great. I'm a bass player really but trying to wrap my head around guitar :p

Don't know much theory but trying to learn. I wonder if anyone can help and explain why there are variations on seventh chord? I understand it's a seventh because of the position in a scale (that right?) but how do you determine which 7th is the right one? Does that make sense? I'm not very good at explaining.

Thanks all, go easy I'm new! :)
Gm
 

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sevenths

G'day Mate,

For seventh chords there are a few basic rules. The four basic triads (3-tone) chords are

1. Major 1-3-5 e.g. C-E-G
2. minor 1-b3-5 e.g. C-Eb-G
3. diminished 1-b3-b5 e.g. C-Eb-Gb
4. Augmented 1-3-#5 e.g. C-E-G#

Now, you can add three types of sevenths to these; diminished, minor and major sevenths e.g. Bbb, Bb, B respectively.

Major: A minor seventh on top of a Major triad is a (dominant) 7
A Major seventh on top of a Major triad is a Major 7
Minor: A minor seventh on top of a minor triad is a minor 7
A Major seventh on top of a minor triad is a minor/Major 7
Diminished: A minor seventh on top of a diminished triad is a minor 7b5
A diminished seventh on top of a diminished triad is a dim.7
Augmented: A Major seventh on top of an Augmented triad is a Major7#5
A minor seventh on top of an Augmented triad is an Aug. 7

Other seventh follow as considerations of alterations of things such as the fifths, but these should get you going.

I hope that's not too confusing, post back if you need further help.

Also, I provide lessons at www.theaugmentedseventh.com The lessons for this type of material are completely free of cost and obligation.

Cheers,
Brett
 
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