String 1–3 Triads in C Major

More helpful on screen graphics here and Full Acoustic Lesson Page Here

We start the triad work in C major, and we start with the payoff: a loop pedal jam over nothing more than a C root and an F root, showing what these shapes let you do before you've learned a single one. The whole lesson is really one idea — C major to C sus4, played in every position on the thinnest three strings — and it's the gateway to the sound of U2, The Smiths, The Pretenders and The Police. Triad just means three notes: root, third and fifth. Every note you'll play in this video is a C, an E or a G, with the occasional F as the sus4. That's it. The magic is in how many places you can find them.

What you will learn:

• The demo jam: what a C chord and a sus4 can do over a simple loop

• The tonic triad and how the shapes anchor to barre chords you already know

• First and second inversions — what the terms mean and where the shapes live

• The sus4 trick: swapping the third for the fourth in every position

• The tone and how to practise: delay, reverb, chorus, and a one-chord loop

The Demo Jam

The lesson opens by telling you the ending: a loop of just a C root moving to an F root, with triad shapes and sus4 embellishments doing all the melodic work on top. You might already know the open-position version of this — C to Csus4, adding an F note instead of the E — as a way to add melody to a chord. Everything in this video is that same idea, relocated to the thinnest three strings and moved up the neck. Add a touch of delay and you'll hear the U2 thing happening immediately.

The Tonic Triad and Your Barre Chord Anchors

The tonic triad is root, third, fifth — C, E, G, starting from the C. On the thinnest three strings in open position, that's a C chord needing only one finger. From there, every shape anchors to a barre chord you already know: the shape at three-five-five is simply the thinnest three notes of your C barre chord at the third fret; the shape at eight-nine-eight is the top of the E-shape C barre at the eighth fret; and the D shape at twelve-thirteen-twelve is a C major chord an octave up — a very Killers, very Johnny Marr place to play it. You're not learning new chords; you're learning to see the tops of chords you've played for years.

First and Second Inversions

Inversion just describes which chord tone is lowest. Tonic triad: root, third, fifth. First inversion: third, fifth, octave — E, G, C. Second inversion: fifth, octave, third. Same three notes every time, stacked in a different order, which is why each one has its own shape and its own flavour. There are useful finger anchors too: on the D shape your third finger is always on the root; on the E shape your middle finger is always on the third. And remember everything repeats at the twelfth fret — the shape at fifteen-seventeen-seventeen is the three-five-five shape, twelve frets up.

The Sus4 Trick

The sus4 is the move that turns static shapes into lead lines: swap the E for an F — the third for the fourth — and resolve it back. Because you know where the third sits in every shape, you always know where the sus4 lives. It's also simply a safe note to add when jamming in C. This one embellishment is doing an enormous amount of work in the songs we've referenced, and it's the reason the four-step plan says learn to play in the key, not just learn the shapes.

The Tone and How to Practise

Delay, reverb and chorus are your friends here — think The Smiths, The Pretenders, U2, The Police — over a very clean sound, picking a little closer to the bridge for definition. To practise: loop a simple C, even just a C power chord, and work through tonic, first inversion and second inversion up the neck, adding the sus4 in each position. It will take a while to find the shapes at first — give yourself that time. Make sure this is solid before moving on, because C is the template for every key that follows.