Most music has a structure called a chord progression, that is, chords within the key that follow a certain pattern. The most widely used is called a I-IV-V (1,4,5) progression. For example, in th key of 'C':
C-I (root or tonic)
D-II
E-III
F-IV
G-V
A-VI
B-VII
C-VIII/I (root one octave higher
by counting off, F and G are the IV an V respectively. In the I-IV-V progression, the chords are C, F, and G. G is the last chord played and finishes or resolves the sequence and the progression will start over or end on the root chord (C in this case).
There are many different Chords out there, but called the "7" is most commonly used on the V chord of a progression. It is within the key signature of the key, and gives an extra bit of urgency in resolving the progression. Blues often use sevenths for the I, IV, and V, giving the blues their characteristic, edgier sound. slapping sevenths in all three chords goes outside the key signature and gives a more meloncholy undertone. Without going into every key, the seventh for F is E flat, which is the minor 3rd for C, the note that makes the chord a minor chord, or a "sad" chord. Normally this is E natural and makes the chord sound "happy". In addition, solos usually use the minor pentatonic (5 note scales) on top of this progression to further give a darker sound.
Nicely put. Chords are at once incredibly complex and mathematical, and yet can be reduced to a deceptively simple description. I'm a bassist, and although I've never really tried my hand at blues tunes (being more of an indie rock fan), I can see perfectly what you're talking about with those sevenths. And i love minors! I do like to use both to vary the feel of the earlier chords in the progression, so perhaps I'm a little more bluesy than I realized....
ReplyDeleteThanks! I started with some piano in grade school, but I didn't really get into music until I started w/ guitar. It's true that musical theory can't be reduced to one blog post, but I think any more would just go over most people's heads unless they play too.
ReplyDeleteDid you start on bass or did you play anything before picking it up?
I actually started on bass. I picked it up because I didn't want to live my life as a musical illiterate, but I also didn't have a lot of time to devote to learning something very complicated. The bass seemed like something I could get into quickly but that has layers of complexity that can be unlocked if/when I have the time to put in the effort. So far, I've not developed as far as I would have liked, but it's fun just to play around with scales and see what sorts of sounds you can make...
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