#1
hi i know that in 12 bar blues its I IV V, i know where to play them and what they sound like but i dont really get the theory behind it.

like the other day in class the teacher said something about flattened thirds. im like wtf? but the bell went so i didnt ask.

can someone please help me out here. cheers
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#3
In the blues progression, you usually play a powerchord and add major 6th on to it, officially making it the "blues riff". Your teacher is referring to a flattened third as a minor third, which is a interval. If you're in E Minor, it's Minor third will be G.
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