The Seventh Chord
- Major-seventh chords have a sweet, 'cheesy' sound, as used extensively in Hollywood soundtracks whenever lurve creeps into a plot. Cmaj7 contains notes C,E,G and B, so you might expect the B and C to conflict with each other (they're only a semitone apart), but as it turns out, these chords sound very pleasant.
-Dominant-seventh chords are the ones normally referred to as plain 'seventh chords". Theysound relatively happy (as you would expect--there's a major triad in there, after all), but they also have a slight tension about them, as if they're pulling you towards a major chord a fourth higher. If you look at the gap between the third and the flat seventh, you'll be able to see where this tension comes from.
-Minor-seventh chords basically offer you a slightly more jazzy and sophisticated version of the sad quality found in minor triads. They sound relatively stable, so you could jam over one for hours without a fear of reproach.
- Half-diminished chords (m7b5) are certainly the least common of the seventh chords looked at so far. They sound more tense than dominant chords, but the two chord types are similar in the sense that they both contain a tension that seems to pull you towards a chord a fourth higher up.
Source:
Creative Guitar
Cuttind-Edge Techniques
By: Guthrie Govan




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