Okay, let s take a big leap. Part of the difficulty of figuring out songs, rock songs especially, is that the guitar can be a master of disguise. Notice that there are no thirds in these chords. To the ear, they are neither major nor minor because the third is not present to define the tonality. The chord progression for these songs stems from a different modal scale and not the simple major scale.
Most people learn various modal scales in order to develop different style for leads and solos.
Me, I prefer to use them in order to spice up my songwriting. Bass players can utilize them to create astonishingly beautiful bass lines. Another way to analyze strange chord changes is to look at a chord as a moving object. Whether you read music or TAB, you do realize that music is indeed a foreign language. There may be notes stacked up on top of one another, as chords or harmony lines.