The "key" to the capo

The general idea behind the One Finger Method is simplicity. At first glance, the capo might seem like an intimidating accessory, but once you get the idea, you will use it.

Some songs I transcribe are in a different key. For those who don't know what a key is, it's a grouping of notes / chords that all fit together and compliment each other. Depending upon how that key is used, you may find it impossible to play without the capo. In general, without checking any books or resources, I often treat the lowest chord in the song as the key. When you figure out your lowest chord, you can put the capo there on the neck, because you wont need any notes below that chord.

This lightens the burden on your hand even further. As if the One Finger Method wasn't easy enough, with a capo on your lowest chord, you don't need to press that position, just strum and the chord is there. This makes changes and other fancy stuff much easier, especially if you happen to be missing finger(s) or if you are just beginning or in my case, getting a little old.

When you attach your capo to the neck, be sure you place it as close to the fret as possible to get a clear sound without depressing the string so much that it goes out of tune. The closer to the fret, the less detuning there is.

The Harmonica is a diatonic instrument, there are no wrong notes because it is all in the same key. Open C tuning turns the guitar into something almost very similar due to the patterns aligning, yet you can still change the key to anything you want.