Time to bring things together! Well, at least some of them...
As said before, the chords of the first, fourth and fifth degree of a major scale (or I, IV, V in roman numbers), namely tonic, subdominant and dominant are possibly *the* single most important barebone of western music (btw, their minor variations are somewhat similarily important but there's some things requiring additional explanations and at least given traditional songs and such, they're not just as as important - but we'll get to them later on).
Perhaps you might want to google that very chord progression, it'll result in an almost endless list of songs. I won't post any examples as I don't even want to get close to any "but how is it done in this or that song?" discussion.
Ok, now that we have all the three chords more or less covered as triads (at least on the D, G and B strings), it's about time to combine all the three. For a start, we will again follow the "minimal voice movement from one chord to the next" rule.
For all examples, I'll be using a I-IV-V-I progression (hence tonic, subdominant, dominant, tonic) as the most relevant movements (tonic to subdominant and dominant back to tonic) are covered.
So the progression in A major will be A, D, E, A.
Here's the 3 possible "shortest movement" shapes (ph34r my l337 new TAB skills!)
A root position, D 2nd inversion, E 1st inversion:
A 1st inversion, D root position, E 2nd inversion:
A 2nd inversion, D 1st inversion, E root position:
Obviously, it's a good idea to play all these. And as progressions using these very 3 chords come in tons of variations (mixing the I, IV and V chords almost randomly), it's possibly a good idea to just fool around with some different combinations.
For the following sound examples I'll stick with I, IV, V, I, though.
Here's the three displayed inversion variations just plain and simple:
And for a very little bit of deviation, one can as well play all of them over an A pedal note (a pedal note usually means one single bass note used throughout multiple chords). The progression is losing a bit of its functional character that way (especially when it comes to the E triad, because the A bass note isn't part of the chord), but it's possibly a nice way to enhance a longer passage where you might usually only find an A chord.
And finally here's something with more movements. I usually try to shift position while staying on the chord (hence using another inversion in another position) and stay within the position when the chord change happens. IMO this is adding some "plausibility" (if you will) because the movements from chord to chord are using very little voice movement, which, in general, is a very typical arrange technique (for all kinds of polyphonic "environments", be it vocals, horns or whatever). You also avoid parallel voice movements that way (which is a pretty wellknown "to be avoided" thing in many arrangement 101s, having its origins in classical music already).
And yes, as threatened, it's the same cheesy country backing thing...
And that should be it for today.