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This might be a cringy question but can you play a minor pentatonic scale of any key with other keys: for example, playing a G Minor Pentatonic scale then switching it a an A Pentatonic minor scale. Of course I already know you can play the same key with different patterns.

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    You use the term pentagonic in the title and throughout the question. Do you mean pentatonic? – Brian THOMAS Oct 18 '17 at 8:23
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Yes.

You can play any scale over any chord (or key). The question is if it sounds good to you—which sounds a like cop out—but it really does come down to taste.

If the scale that you want use has a lot of notes in common with the current chord being played, it will generally sound very consonant or "inside" (because the notes are inside the scale). When the scale shares very few notes or none at all, it will sound very dissonant or "outside". Both have their uses especially when you use them together—as in playing "outside" for a bit and then resolving to an "inside" sound. That's the part where taste comes in—how far outside can you get where it still sounds good to you and for the genre that you're playing?

Here's an example of how major pentatonic scales relate to C major. You can get the minor pentatonic version by transposing down a minor 3rd (ex. C Maj -> A min):

Pentatonic outside notes

(note that there's a labeling typo in the diagram, the Db on the lower right should read B)

With all that said here are a few suggestions to get started:

  • Try going progressively more "outside" and decide at what points it sounds good and bad to you.
  • Try going very outside briefly and then coming back inside. This works especially well right before resolving to tonic. So if in the key of C you see a G(7) to C(Maj7), try something "outside" for the G7.
  • An easy way to get started with that is by "side slipping" or temporarily moving the scale only a half-step up or down to go outside and then back a half-step to where you started.
  • Eventually you should consider not just what scales are inside or outside according to the overall key but the current chord specifically.
  • This is how i always thought of the pentatonic scale. Instead of one diatonic mode, you can have the choice of three pentatonics with a different flavour for each one. Great answer. – Ye Dawg Oct 18 '17 at 5:14
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You can do this as a technique to find other notes that you like, but what you are likely doing is implying notes from other scales: let's take an example

You're in a minor using a minor pentatonic:

A C D E G

The you try E minor pentatonic:

E G A B D

It sounds good. But what you are actually probably enjoying is the one additional note: B. what might sound better would be to incorporate this note into your playing, and play these 6 notes: A B C D E G

Experimenting using other pentatonics can be a good way to find other notes that you like within a song, but if you do that, make sure you then find where all those notes are in the same position as your home key pentatonic: that way you will learn something about the notes themselves, and instead of just "moving the pentatonic box", you'll learn something about what additional notes sound good in a particular song you're playing. Don't just take your first position pentatonic and move it around the neck of the guitar, that way you are "hiding" your own musical discoveries from yourself!

You might also experiment adding RANDOM notes to your pentatonic scale, instead of playing completely different pentatonic scales, find out what happens if you "fill in the gaps" of your pentatonic scales in various different way. What works, and what doesn't in what songs?

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The minor pent strictly speaking fits only the chord of the same name. However - it makes interesting listening when used over the same name major chord. Guitarists in particular have used it for decades. In fact, some of the solos used on tracks from '60s etc. are made up entirely of those 5 notes. Even when the underlying chords change!

It works, but there are better fits. But the question is 'can you?', to which the answer is 'yes'.

Let's take the notes from Am pent. A C D E G. Now those from the chord a 4th higher. D F G C A. Note (pun intended) that playing the first set of notes on A works, but with the second set, there's only one note different. Let's go a 4th lower. E G A B D. The original C is replaced by B, the others remain. So, with careful selection of notes played - and where they're played - 80% is the same anyway. This is why using Am pent. notes all through a 12 bar, with A, D and E chords, works fairly well. One or two 'avoid' notes, isn't too bad !

If you are asking whether you can use Am pent. notes over, say, chords in F#, well, try it ! Your ears will probably provide an answer. Not really. But, music is all in the ears of the listener, and stranger combinations of notes have been produced. So, instead of asking for our guidance, give it a try. You may (or may not) like the result.

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