[Music] Blues/Blues Rock Chords?

[Kokowam]

I realized how limited my chord repertoire is recently and thought I should expand my knowledge to more chord shapes for the guitar so I was wondering what chords are often used in Blues/Blues Rock songs. Any help will be appreciated :3

[pacdiggity]

Well, blues follows a chord pattern, and rock is a bit more vague. Both use I, IV and V mainly, but sometimes other chords.
12-bar Blues consists of 3 lines of 4 bars each. Here is the base pattern:
I I I I | IV IV I I | V V I I
There are many variations on this.
I I I I | IV IV I I | V IV (or V⁷) I I
I IV I I | IV IV I I | V IV (or V⁷) I I
You can also add sevenths to this to end up with something like this:
I IV I I7 | IV IV7 I I7 | V IV I V7 (when the last bar contains the dominant chord, it leads into the next verse)

Rock goes into a bit more stuff, but usually you'd just be using your I, IV, V and occasionally ii and vi. With sevenths.
Pop, as we all know, follows a simple 4-bar progression - I, V, vi, IV. This may be mixed up.

[Kokowam]

Thanks, but I was looking for chords that tend to be used in blues. Like I, IV, V, and vi are great, but I was wondering what other chords are often used (such as a 13th chord or a 7#9 or something like that idk).

But by no means am I not thankful. And by rock, I meant specifically Blues Rock (things like "I Don't Need No Doctor" or some Clapton stuff and things like that).