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Dirty-South Blues Harp forum: wail on! > When to use Blues or Major scales??
When to use Blues or Major  scales??
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Jim Rumbaugh
129 posts
Jan 21, 2010
9:43 AM
I'm talking to my local gang about scales. Today we are going to talk about Blues scale vs Major scale. I know this will be new to most of the group.

I'm trying to figure out a guide as to when to use each. We do 2 tunes that need a mojor scale. "Bring It on Home" and "Have You Ever Seen the Rain" I'm about to say if the second chord of the progression is a 5th, then you will probably play major scales. Any feed back or opions or theory??? or is it all in "the ears" as to what you hear?
GamblersHand
132 posts
Jan 21, 2010
10:18 AM
Jim, it's a question I'd like answered too

First, your theory of the change to the V doesn't work unfortunately - quite a few blues songs do this, Nobody's Fault But Mine, Key to the Highway, especially 8-bar blues.

Also, I think that I play Bring it on Home (Sam Cooke) using something close to the blues scale, but there have been a few folk and country-ish versions that perhaps your band bases it on. Or maybe I'm just playing it wrong

Musically, some giveaways for blues progressions are the use of "dominant 7ths", often on the V chord, but even more bluesy if on the I and IV. Also the use of VIIb or IIIb chords that you often get in Stones or Led Zep songs mean that the blues (or blues + pentatonic) would work.

For major scales I'm less sure - but say a III chord, ie. Em when in the key of C, would indicate that it wouldn't be a blues scale. This is because the chord - EGB, uses both the major third and the major seventh. A blue third or 5 draw in cross would sound ugly against this chord.

An dimished 7th would be a similar indicator, but they're pretty rare.

And possibly proving my theory, Have You Ever Seen the Rain has a III chord Em in the chorus.

Last Edited by on Jan 21, 2010 10:18 AM


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