(Really Long post, apologies but should help!
) – This might seem like a long theory ramble but this is some info that really helped my playing.)
Hey Pablo! When P.G is referring to a 1-4-5 he’s referring to the 1st, 4th and 5th chord in a Major Key.
I’ll use E Major as an example (as you’re wanting to solo in that key)
I’ve found that the ticket to understanding your soloing options is understanding how each chord in a chord progression fits in context of it’s wider key and fleshing out sounds and ideas from there using different methods.
So E Major, right? First thing is knowing your E maj Scale: E F# G# A B C# D#
Then understanding how you make chords out of the scale (giving you all chords in the key of Emaj). It’s easy peasy! You just stack every second note until you get a three note chord (Triad) – (You can stack one more note each time to get Seventh chords but its not important rn)
For example, 1st chord would be: EG#B -E major Triad – (I got that from selecting E – missing F# – Selecting G# – miss A- Select B)
If you repeat that process for every note in the scale as a new chord you get: 1.EMaj 2.F#min 3.G#min 4.AMaj 5.Bmaj 6.C#min 7.D#diminished – These are all chords in the key of Emaj.
So a 1-4-5 would be Emaj, Amaj, Bmaj
It’s important to know how the chords are made/ordered because this can give the hints as to where we go to solo.
You mentioned about using the Minor Pentatonic from the relative minor, great idea! And the relative minor of every major key starts from the 6th scale degree in the major scale. (C#minor pentatonic) – You wouldn’t really call it Db minor but it’s not that important why
For a blues sound, the minor penta scale definetely goes a long way!
I won’t go on and on but the best thing to do is look at the key of Emaj as a whole when approaching the chord progression and experiment with the modes of the scale and the arpeggios associated with the chords. – (Look up the Modes of the Major Scale absolutely nothing to fear with that stuff!)
(I’m aware some parts of this explanation dive deeper than others but as long as you understand the wider key and experiment with the family of chords/scales/arpeggios/modes within the key, you should happen across some cool stuff! – There is a LOT more to unpack regarding all this but hopefully this is an alright start.
In short, the Key is key, ha!
Sorry for the lengthiness and vagueness in parts, let me know any Q’s you have. Happy soloing man!