Originally Posted by: greyghoast17What are the best lesson's on this site to learn to harmonize a scale within a key using a chord progression major and minor. Learning harmony up and down the neck is something I want to be more proficient in, specifically for rock, metal or blues guitar.

I've been working on a tutorial that explains this in depth. But it's not done yet. :) For now, there is this tutorial that Anders did that kind of covers it.

http://www.guitartricks.com/tutorial.php?input=1590

There are songs that use it.

http://www.guitartricks.com/tutorial.php?input=1742
http://www.guitartricks.com/tutorial.php?input=1304
http://www.guitartricks.com/tutorial.php?input=1124

There is also this channel episode that shows an example of how to do it!

http://www.guitartricks.com/lesson.php?input=17048

And this tutorial on basic music theory explains the fundamentals of how a scale is harmonized into chords. That is the foundation of harmony soloing!

http://www.guitartricks.com/tutorial.php?input=495

Hope this helps!