Take this D major backing track for example
The thing is, in this case, the D minor pentatonic doesn't sound very good if I play over that backing track. Although it sounds great if I play the D major pentatonic (which as far as I know I think it's "the same" as S# minor pentatonic?):
Then we have this one which sounds great if I use the E minor pentatonic, but doesn't sound really well with the E major pentatonic.
Ok, great. Minor for minor and major for major, I guess I get that.
Buuuuuut then we have this, which is "E blues":
Both sound great, the minor sounds perfect and the major has a more "happy" sound and both combined have a more "bluesy" sound (I hope you understand what I'm trying to say xD)
I'm assuming that all this happens because of the chord "progression" (I don't know if that's how it's said), each one of those backing tracks is using different chords (at least in some parts) and that's what "causes" this.
So my question is, which chords are those backing tracks using? One of the videos actually says the chords but I'm wondering about how do you "form" the chord progression for any key.
All I know about this is that if I want to play in say, A, I have to find it's I, IV, V chords (which would be A, D, E) and then play I7, IV7, V7 (so A7, D7 and E7). If I do so, then the A minor pentatonic sounds good.
But how does this work? Is this progression (I7, IV7, V7) in any of these videos or not at all?
Basically what I'm wondering is what "formula" should I use to know the chord progression if I want to solo with the major pentatonic, which for both at the same time and which for the minor pentatonic (I'm assuiming the I7, IV7, V7 is used for the minor pentatonic :/).
And generally speaking, what type of backing tracks are ok if I want to play with both scales? Should I search for "E blues backing track" rather than "E backing track?"
Anyways thanks for your time and have a nice day!