Familiar chords can still sound distinctive
You do not need complicated harmony to write an indie guitar part. A progression such as G–D–Em–C can work perfectly well.
Instead of immediately searching for more unusual chords, change how you play the progression. Let open strings ring, move part of the progression higher on the neck, play triads instead of full chords, or change from arpeggios to strumming between sections.
The guitar arrangement often matters as much as the progression itself.
Let open strings ring between chords
Open strings can connect chords that would otherwise sound separate.
Shapes such as Cadd9, Dsus2, Em, and G work especially well for this because several strings can continue ringing while the fretted notes move underneath them.
You can use the same idea with partial chords and triads higher on the neck by finding one note that stays constant across several chord changes.
Start somewhere other than the I chord
A progression does not always need to begin on the tonic.
Starting on the IV or vi chord can make a loop feel less immediately resolved while still using completely diatonic harmony.
For example, C–G–D–Em is made from the same chords you might use in G major, but starting on C gives the progression a different sense of direction than beginning with G.
Use borrowed chords for a stronger change in color
One of the simplest ways to make a major-key progression more distinctive is to briefly borrow a chord from the parallel minor key.
The minor iv chord is especially useful.
In C major:
C – Em – F – Fm
The F major to F minor change introduces one altered note, but that single note dramatically changes the mood before the progression loops back to C.
Change the rhythm before changing the chords
A four-chord loop can support several different guitar parts.
Try playing the same progression as:
- slow arpeggios
- steady eighth-note strumming
- muted downstrokes
- syncopated chord stabs
- single strums with long sustain
- triads higher on the neck
This is often more useful than replacing the progression every time you want a new section.