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Conference napalm::guitar

Title:GUITARnotes - Where Every Note has Emotion
Notice:Discussion of the finer stringed instruments
Moderator:KDX200::COOPER
Created:Thu Aug 14 1986
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:3280
Total number of notes:61432

1398.0. "Harmony Question---Substitutions in Blues Changes" by AQUA::ROST (It's the beat, the beat, the beat) Wed Jul 26 1989 08:56

OK, theory buffs and obsessive guitar noters, here's a question:

I'm slowly working my way through learning chord substitutions for blues
progressions, and came across the following changes:

        C                   F                   C
 	/   /   /   /   |   /   /   /   /   |   /   /   /   /   |

        Gm7     C           F                   F7      F#o
 	/   /   /   /   |   /   /   /   /   |   /   /   /   /   |

                                    Eb7
        C                   Em7     (A7)        Dm7
 	/   /   /   /   |   /   /   /   /   |   /   /   /   /   |

                                     C          Dm7
        G7                  C       (F7)        (C)     G7 
 	/   /   /   /   |   /   /   /   /   |   /   /   /   /   |


	The chords in parentheses are possible substitutes. i.e. A7 for Eb7, 
        C for Dm7, F7 for C.

By using either C major or C mixolydian modes, I can get all the notes I need
for all of the chords *except* two, the F#o and Eb7.  What I  see happening is
that these chords provide a root motion to the next chord.  My question is: why
does this work?  What is the basis of this harmony?  Do I just use C mixolydian
everywhere and then toss in the "off" notes like Eb and F# in the bars that
call for them or what?  

BTW *my* interest is in creating a bass line. After that, maybe I'll worry
about soloing.  8^)  8^)  8^) 

                                                  Brian
T.RTitleUserPersonal
Name
DateLines
1398.1Anybody Home???AQUA::ROSTIt's the beat, the beat, the beatTue Aug 08 1989 22:104
    
    Glad to see that everybody is pitching in on this one  8^)  8^)
     8^)
    
1398.2any good?MARVIN::MACHINWed Aug 09 1989 06:488
    Well, just to keep you company, I'd have thought the 'off' notes,
    Eb and F#, work because they're the sevenths you need for your 
    progression in C (Eb for F (as in playing c minor over F) and F# for
    G).
    
    Wack 'em in, I say.
    
    Richard.
1398.3Okay, I'll bite...IOSG::CREASYA bunny rabbit! I shall name him George!!Wed Aug 09 1989 08:2635
    Well, I didn't answer because I don't qualify as a theory guru, or any
    of those other good things Brian described in .0  8^)
    
    Anyway, if you analyse the chord progressions (which I'm sure you have
    done) you see that they both resolve chromatically.
    
    The F7-F#o-C progression is:
    
    F7		F  A C Eb
    F#o		F# A C Eb
    C		C  E G
    
    The chromatic movement comes from F - F# - G, which is the V of Cmaj,
    and so provides a strong resolution. Writing a bass part for this,
    you've got quite a lot of options: 
    
    	emphasise the chromatic part and play F F# G
    	remain motionless while the chords change about you (play all Cs,
    	or A -> G or Eb -> E
    	play a descending line (eg A-F#-E, C-A-G)
    
    Which sounds best will depend on how the other musicians are resolving
    THEIR parts (ie whether the voicings they use go "up" or "down").
    
    The other progression is more obviously chromatic. In fact, I think I'd
    have substituted Ebmaj7 instead of Eb7, because then 2 of the notes
    would move, and 2 stay the same. Because all the other musicians are
    almost BOUND to play these as adjacent, descending note clusters, I'd
    look for an ascending bass part. D-Db-F appears in the progression, and
    you might like to play with D-Db-E, as E is the ninth of Dm - it might
    work, or it might sound horrible!!
    
    HTH (a bit)
    
    Nick
1398.4more thoughts ...GOOROO::CLARKroots, wings, and oat branWed Aug 09 1989 10:5521
    Well, I would view the F# dim as an F7-9 chord, and, like somebody
    said, it progresses nicely to the C because of the F-F#-G.
    
    The Eb7 is a tritonal substitute for the A7. Note that both chords
    share the G and C# (Db) notes, with G being the dominant seventh
    in the A7 chord and the 3rd in the Eb (and vice versa). These kinds
    of substitions can really spice up a bland chord progression:
    
    C-A7-D7-G  can become
    
    C-Eb7-D7-Db7  or C-Eb7-D7-G7 or C-A7-Ab7-G7
    
    and you can start adding notes to the chords or changing thirds
    to flat thirds:
    
    C-Ebm7-Dm7-G7b9 or C-Eb13-D7+9-Db13
    

    etc.
    
    -Dave
1398.5Sub-Five's, babyMARKER::BUCKLEYlong way 2 the top if u wanna R&R!Wed Aug 09 1989 12:1310
    > C-A7-D7-G  can become
    
    > C-Eb7-D7-Db7  or C-Eb7-D7-G7 or C-A7-Ab7-G7
        ^^^    ^^^       ^^^               ^^^
    
    Berklee calls these monster's "Sub-five's".  A sub-V(7) is any V7 chord
    which chromatically resolves to another dominant chord.  In blues, you
    can sub-five up the ying-yang and it still sounds great.  I mean, its
    almost hard to overdo sub-V resolutions, but it can be done...they
    sound great, while not inhibiting the soloist harmonically!