More on guitar chord progressions

Here’s a nice two-part lesson on chord progression from heartwoodguitar.com This will help demystify the mysteries of guitar chords!
“If you’ve been playing guitar a while, you’ve probably noticed that certain chords seem to go together. For instance, if you’re playing a song in the key of G, chances are you’re going to encounter C, D, and Em too. That’s because those chords belong in the chord family of the key of G.
And there are three chords within any family that really stick together: The I, IV, and V chords. Think of them as inseparable siblings. Just to get you started hearing these chord relationships, play an A, D, and E chord, one after the other. Now play G, C, and D. Now try D, G, and A. Hear a similarity? You just played a I - IV - V progression in three different keys.
Knowing your chord families is really helpful. “But Rob,” I hear you saying, “I had a hard enough time remembering names at my own family reunion in St. Louis last summer. Why should I press my luck with someone else’s family?”
I hear you. I frequently have to count back when someone asks my age. But because popular songs are often comprised just of chords in a single chord family, knowing this stuff makes it much easier to figure out songs by ear, compose your own music, and change songs to other keys. And it’s really not that hard to learn the basics.”
heartwoodguitar.com
(Don’t forget to look for part two!!)