Can you use it in any fret? Do you have to include all the notes in the scale? Can you use notes not in the scale? If you can,wy bother learning the scale?
Minor Pentatonic -
Typically you might solo using a minor pentatonic scale over a minor chord with the same root – like A min Pent. over A min.
If there is a chord progression involved (a section of a song that cycles through several chords and then repeats) that starts with or centers around A min., solo A min. Pent. over it.
The Blues Scale -
Next you should try A min. Pent. over A min., but add the E flat note (a "flat 5th") to make the 6 notes of the "Blues scale." Knowing the blues scale is crucial to knowing how to solo, or at least in the traditional fashion.
With the blues scale, be sure to bend the 4th interval into the flat 5th, or emphasize the flat 5th in any other way possible for a "bluesy" sound (the flat 5th interval is called "the blue note").
The blues scale is not "pentatonic" because it has 6 notes; pentatonic means a scale with 5 notes (not including the octave).
Major Pentatonic -
Then try C Maj Pent. over A min. (C Maj. Pent. has the same exact 5 notes as the A min. Pent. scale, but the pattern starts from the C note instead).
The terms for this relationship are as follows: C Maj. is the "relative Major" of A min., and A min. is the "relative minor" of C Major.
Other Pentatonic scales -
So, when starting the scale from the second note of the A min. Pent. scale, we get the C Maj. Pent. scale. Then try starting the scale from the 3rd, 4th, and 5th notes of the A min. Pent. scale to get pattern variations (this is very useful because it extends your playability across the neck further).
…also you can play a minor or Major Pentatonic scale over an unlikely chord to create a new scale when the notes of the pentatonic scale and chord are added together (example: A min. Pent. over B minor to create the B Phrygian "mode").
This superimposition of pentatonics over chords is advanced territory, and is an advanced usage of the "modal system," or the classical scales termed "modes."
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…what "intervals" refers to is the numeric order of notes in distance from the root note, and in terms of the Major scale.
Here’s the C Major scale:
C – 1,
D – 2nd,
E – 3rd (or "Maj 3rd"),
F – 4th,
G – 5th,
A – 6th (or "Maj 6th"),
B – 7th (or "Maj 7th").
Here’s the A minor scale:
A – 1,
B – 2nd,
C – flat 3rd (or "min 3rd"),
D – 4th,
E – 5th,
F – flat 6th (or "min 6th"),
G – flat 7th (or "min 7th").
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…also, "Major" is always capitalized, and "minor" is never capitalized.