Example If you play a D minor chord and played Riffs based off of the Minor Scale in the Key of D, that would be Harmony.
That is not what this lesson is about.
In a previous lesson you learned about the Blues and Blues Altered Scale;
Blues; Blues Altered
D|-----------1-3-| D|-------------4-|
A|-----1-2-3-----| A|-------1-3-4---|
E|-1-4-----------| E|-1-2-3---------|
Why does the Blues Altered scale sound sometimes good and sometimes bad? How will I know when it will sound good?
The Blues Altered scale only works because the first 4 notes are the same as the 3rd throu 6th notes. If you play those notes together then switch to the next part of the scale through Transition than your music will sound good.