Hello! Im trying to learn some theory in blues now. Yesterday, I came across a blues theory video at youtube. Im quite new to theory so i really would like you to help me with this questions cuz they make complete no sense to me.
He sais like this (12 bar blues progression):
"In the key of A we call the A chord for the one chord or the tonic chord, based on the first note scale.."
Does he talk about the penta scale? If I play in the key of E, would that make the E chord the one chord aswell, based on where i started the progression?
"When you go to the fourth note of the scale, you have a D. We call it a four chord"
But if i play the penta at the key of A, the D is the third note....?Why do you call it a four chord?
A------(5)
E ------5----8
"Then the E is right next to the D, so we call it the five chord."
Um....I dont get it....Do i measure the notes from the penta scale or what. Why is it called the the five chord? And how can it be right next to D? Dont we have flats or sharps in between?
"And 1, 4, 5 is the foundation of what we call blues."
I guess he's reffering to the chords. But if i was playing in the key of E, Would that make it 1,4,5 or would the notes be different?
"We call this chord the ninth chord (B9 for turnaround), And the reason is because it contains an extra note, its called the ninth."
Could someone explain to me what the ninth note is?
I know that quite a lot to answer in one Go, but i would really appreciate if you help me with this.
Thanks in advance