As a proponent for forgetting scales UNTIL you know some things going on with the music, here's another example...
Full scales are not ALL the notes you can play, but all the notes you MIGHT want to play.
For Rock music there's a simple way to get at the heart of what's going on musically, as opposed to going directly to a preconceived scale pattern. Thinking in terms of full preconceived scales can cause a lot of "fluff" into your guitar playing. It can lock you into "patterns" and in a lot of players cases it can keep you from ever playing music instead of stock riffs.
For instance take this VERY common progression similar to All Along the Watchtower, Stairway to Heaven, and COUNTLESS 80's hair metal tunes...
||: Em | D | C | D :||
Most rock guitarists would play these chords with nothing but diads/two note power chords, like this:
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Em D C D
E------------------
B------------------
G------------------
D---9---7---5---7--
A---7---5---3---5--
E-------------------
Played as just power chord most novice guitarist would just call this || E | D | C | D || without even caring about the Em sign or name.
Now the other thing is, most guitarists will immediately choose the E Minor Pent scale, or maybe the more "advanced" (in thinking) will choose an E Natural Minor.
But in either case the novice is just going to blow through "the pattern".
Let's take those simple two note power chords (E D C) and see what they tell you about what "music" is taking place.
What we'll do is look at the notes in the Power Chord, arrange them in a scale, and then hopefully things will be REALLY clear as to what their notes tell us.
E Power Chord = E B
D Power Chord = D A
C Power Chord = C G
Now lets arrange them from the "I chord" in the progression, E:
E G A B C D
Six notes.
The E Minor Pent that most people would use only has 5 notes:
E G A B D
With this idea of finding out what the hell notes you're ALREADY using in the chords, in many cases (especially in Rock) you can paint a HUGE idea of what notes to use for a scale. And this can be done with little to no "scale knowledge" at all.
In this case it shows you WHY the E Min Pent is a scale of choice, because all 5 notes are DIRECTLY related to the chords being played. But, it also shows you ONE MORE NOTE to use that's missing by the "just play in the E Minor Pentatonic" concept, and that new is DIRECTLY related to the chords being played.
Now forget E Min Pent (and E Nat Min) for a bit and use ONLY the chord notes as your scale (E G A B C D):
E------------------------------------------------------12--15--
B-----------------------------------------12--13--15-----------
G--------------------------------12--14------------------------
D------------------------12--14--------------------------------
A-----------12--14--15-----------------------------------------
E---12--15------------------------------------------------------
By doing this you are using one more note than the E Min Pent, but also one more note LESS than the E Nat Min. BUT, you are covering EVERY note in the chords you are playing. This alone will allow you to feed off the exact chord that are being played and to cover them nicely.
Now as a theorist I know that using the full triads give me other notes too. But, I'm not playing full triads in that chord progression, am I??? But also as a theorist, if I go through this process with the triads I'll also see where any extra notes are the strongest...here's an example with the note we are using already...
In this particular progression you can use that C note almost any time you want. But, try this...
let's "hide the C" or "save the C" for when it's most IMPORTANT music wise...
ONLY use the C note while you are on the C chord. Take it slow, play all the other notes over Em and D, but when you get to C, LAY on that C note. Make it really prominent.
It might take you some time to be able to conscientiously not play C except ONLY over the C chord. But it'll be worth it because you will hear were the C note has the most weight/importance in the chord progression. And, it will start to point you in the direction of REALLY PLAYING OVER THE CHORDS, AND NOT JUST PLAYING A SCALE.
Try small ideas at first. IOW, forget about ALL the notes and try this...
For the Em and D try using ONLY these to make your phrases:
E------------12--15--
B---12--15-----------
G--------------------
D--------------------
A--------------------
E--------------------
But when you get to the C chord use ONLY these notes:
E------------12--15--
B---13--15-----------
G--------------------
D--------------------
A--------------------
E--------------------
You will find that by doing this, it's VERY hard not to play melodically. This is due the C having the heaviest weight on the C chord and not as much on the Em and D. Hopefully you'll also find that the "just play the E Min Pent or E Nat Min" idea starts to sound very UNMELODIC in comparison.
That's a ton of great stuff that three measly power chords can show you about the music. Spend more time on the music than the scale patterns ;)
Have fun!!!