Thursday, June 5, 2008

Using Pentatonic Scales

Q: I've obviously learned all the 5 minor pentatonic boxes over time, and am wondering if im using them in the best way. For example over Cmaj7-Am7-Dm7-G7 I use the A minor pentatonic box shapes. Is this a common thing to do? Sometimes it sounds a bit too 'off the mark' and unfocused dues to playing bluesy licks based in these positions over a major chord progression.Do you use this approach ever? It just seems learning all the 5 blues boxes has got to be more useful than JUST playing over blues don't you agree?

A: Regarding your Cmaj7-Amin7-Dmin7-G7 and pentatonic scale question:

There are many things to consider here. Genre and your level as an improviser. If you are starting out, I think the most important thing is to get you playing, so I might tell you; Yes, use the A minor/C major pentatonic scale over the whole thing. But assuming you have more experience, I would give you slightly different advice.

Anytime you use any given scale oven a progression, the most important notes in the scale are the notes that are also in each of the passing chords and therefore need to be focused on. Looking at the A minor/C major pentatonic scale: C-D-E-G-A.

Now look at the chords:
Cmaj7: C-E-G-B
Amin7: A-C-E-G
Dmin7: D-F-A-C

G7: G-B-D-F
The red notes are common notes with the pentatonic scale and the ratio (chord tones/scale tones):
Cmaj7: C-E-G-B (3/5)
Amin7: A-C-E-G (4/5)
Dmin7: D-F-A-C (3/5)
G7: G-B-D-F (2/5)

You can see that regarding the first two chords, the C major pentatonic scale is dead on. Dmin7 is ok, but take notice, the strongest tone, the 3rd of the chord is not included. The scale is very weak against the G7 chord, only the root and 5th and no 3rd. This is probably why you say that sometimes the scale is "off the mark." There aren't enough common tones for the G7 chord for it to sound on. You could make it work by really aiming for the G and D notes on the V chord, like you would with the blues.

If you wanted to take a pentatonic scale approach, it would seem that it would be better to:

A) Use the C major/A minor pentatonic scale but don't approach it like you are playing in A minor or A blues, rather treat it as the progression it is: An 
Cmaj7-Amin7-Dmin7-G7 progression making an effort to start on a chord tone every time the chord changes. If you think you can play the same licks like you would over an A Blues, it will sound wrong.

B) Use the C major/A minor pantatonic scale over the first three chords, and a G major pentatonic scale over the last.

C) Use the C major/A minor pentatonic scale over the first two chords, a D minor pentatonic scale over the Dmin7 chord and a G major pentatonic scale over the last.

As an example, take a listen to this video of me playing in Tokyo. The song is Jimi Hendrix' "Little Wing." I'm mostly playing an E minor pentatonic scale over the whole thing but play a D major pentatonic scale over the final D chord in the progression. The top of the chorus where I do this is at 6:30 and I use the D major pentatonic scale at: 7:00:




You have to take into consideration the extensions on the chords though. For example your ratio will change if you make the chords into min9 or min11 chords. In this case there would be better scale choices.

A Jazz player would be more inclined to take more of a chord tone approach or modal approach.

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