I actually think there might be a city ordinance against the use of music stands in a blues club.
I got a special variance so I could use a stand for my lyrics. I can't never remember if my baby left me, or I up and left her.
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I actually think there might be a city ordinance against the use of music stands in a blues club.
In functional harmony, a secondary dominant chord is a 7 chord which is not being played on the 5th degree of the key centre. For example, in the key of C, the only 7 chord that remains diatonic to the key signature is G7, In F the V7 is C7, in Eb it's Bb etc. However if you look at a lot of jazz standards you'll see a lot of 7 chords which are not diatonic to the key. These are called secondary dominants and extended dominants. The most common use of a secondary dominant is in the old reliable III-7-VI7-II-7-V7 turnaround. Technically when the VI chord is played as a 7 chord instead of a minor 7, it is not diatonic to the key, which makes it a secondary dominant. As a consequence of this, when you see a VI7 in a III-VI-II-V, it's not a VI7, it's a V7/II (because it is the dominant chord of the 2nd degree of the scale). I apologise I know my answer is long winded, I really hope it was helpful.
To answer your question though, this is why I call it a substitute secondary dominant:
If the tune is in G and you're playing an Eb7, then first and foremost, the most obvious thing about this chord is that it is a tritone substitution, for A7.
A tritone substitution is what the name says it is, A substitution of any dominant chord with another dominant chord which has a root a tritone away eg.
/D-7 G7/ Cmaj7/ can be substituted with /D-7 Db7/Cmaj7/
This because G7 and Db7 (or any other two dominant chords a tritone apart) share the same tritone on the same chord tones (3rd and 7th)
G7 Db7
1. G 1. Db
3. B 3. F
5. D 5. Ab
7. F 7. B
Now since the Eb7 is a substitute dominant for A7, the next thing to note is that A7 is not diatonic to the key of G, and so it is a secondary dominant. A7 would be the V of D, D is the 5th of G and therefore A7 is the V7 of the 5th degree or the V7/V. Which makes Eb7 the substitute secondary dominant or sub V7/V
Any clearer?
Anyway, the blues is a modal progression and can't really be explained by functional music theory unless you claim the key is changing every other bar.
There's some new scientific evidence floating around these days in regards how we listen to and internalize music from our ears...to our brains.....and finally, to the basic emotional levels of our being. (see DURRL'S [Chris Fitzgerald] thread about Your brain on music.)
Here's my final analysis of what's happening with this thread.
The theoretical stuff that some of you are talking about is important to some, and for SOME....NOT so important. Not to be self-indulgent.... (which is a real bitch for me) but I can only use my own experience in music to make my point.
I'm a self-taught pro jazz bassist. My need to play music came from a deep seeded emotional hunger within me. I had to have it. I didn't want it. I HAD to HAVE it....much like food or water. I didn't approach learning the blues from a theoretical analysis of the material like some of you seem to HAVE to do. Believe me, there's not a thing wrong with that...BUT, the basic vibe or the need for the messenger to get the message out to the messengee IS what we are searching for here. If you need all that stuff on a piece paper to get the job done....peachy. Your call. But, if you do your homework, I think you'll agree that the great messengers of really heavy emotional, personal musical statements didn't HAVE to HAVE it, at least in the begining...it was already there, waiting for a way to find it's way out of them. To me, that's the musical bottom line.
Take the great jazz singer Billie Holliday. I spent a few years in the biz not liking her. (actually, not getting her) Her voice grated on my ears and made me a bit uncomfortable listening to her. Then I heard her sing a real happy-go-lucky, walk-in-the-park-with-your-boy friend on a day-in-May kind of standard tune, and I GOT it. Holy crap! The poor lady has the damn blues! My god, that's tragic. Wow...she broke my heart. It hurt me deeply....BUT in a very beautiful way. I liked that feeling.....sad? You bet. But, never the less, beautiful. To me, that's the real meaning of the "blues"......I DO think that that was the real intention of the blues.
Blah, blah.......no matter the musical framework, the amount of bars in the material, the amount of notes on a piece white paper, #'s b's Bm7th's alt. angularists G/Cmaj9th's, it will always remain the same for me. A very basic need for one human to communicate with another on a non-verbal level.
I told my friend (who is a killin piano player and has a Masters and work toward a PhD in Theory) about this discussion and now he jokes "Man, you missed the Neapolitan 6 chord. You're fired."

You got me. I lied. I don't have any friends.

What bothered me the most was that I didn't think that even SHE had the blues! Dint sound like it to me. Why would a "western swing" singer ever get them blues? Don't get me wrong...I'm sure Roy and Dale were brought down pretty dark when Trigger kicked (no pun intended.) And, by the way, I KNOW they had his ass stuffed (actually, I heard that they had his wholeownself stuffed. Not my Idea of a mentally healthy way to handle them blues.) 

Paul, nice pic and your smiling![]()
if youre talking about roman numeral degrees i would never call the substitute dominant of the V chord a #V chord. its really a SubV/V
i would just write Eb7 | D7 | Gmin or Gmaj
problem solved