A country and folk staple that climbs stepwise from the tonic through the ii before opening to IV and V.
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Drop I–ii–IV–V straight into the interactive looper, hit play, and hear the full sequence cycle.
Play I–ii–IV–V in the Studio →Am supplies a moment of minor colour without leaving the key, and it sets up the IV and V that follow. Because the ii sits a step above the tonic, moving to it feels like a small lean forward, a gentler way to leave home than jumping straight to the IV.
It inserts the ii chord between the I and the IV. That extra chord turns a three-chord cadence into a four-chord loop, adds a bass note (A) to the walk, and gives the progression a touch of melancholy that plain 1-4-5 does not have.
Yes. Am7 in open position is Am with the third string left open, and it fits G major just as well. Many players use it in this progression because the open G on top of the chord ties it to the tonic and makes the change from G smoother.