From straight arpeggios to chromatic colour – building lines over a II-V-I progression.
Arpeggios are often treated as a technical exercise, something to run through in isolation before getting to the “real” playing. But used well, they’re one of the most direct ways to outline a chord progression and build lines that genuinely connect to the harmony underneath. Starting with a simple II-V-I and gradually layering in rhythm, extensions, and chromaticism is a great way to turn straightforward arpeggios into something that actually sounds musical.
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Building arpeggio lines over a II-V-I
A great starting point for this is a progression in D major using Em7-A7-D. Get used to the sound of these arpeggios first, and pay attention to how the A7 (the V chord) wants to resolve back to D (the I chord). There are plenty of fingering and position options for playing arpeggios, so it’s worth experimenting with different shapes — and trying them in other octaves and keys too.
This kind of line has genuine versatility. In a jazz context it could work as a walking bass line; in funk, Latin, or reggae, it might work better played as crotchets rather than quavers. It’s also useful as an improvising tool in its own right — try playing it over the chords and you’ll hear how each note locks into the harmony as the chords change. It’s a solid starting point, but played this straight it can sound a little too literal. Changing up the note order and rhythm slightly is an easy way to make it sound more natural and less mechanical.
Using the same chords, try slowing the tempo down to leave room for semiquavers. This works well over a straight funk groove, or as a half-time funk shuffle if you want to swing the feel.
From here, extending the arpeggios to include the 7th note opens up more possibilities. Try the chords extended to m7, dom7, and major 7 — this time in the key of Bb major. As before, layering in more rhythmic and intervallic ideas turns a fairly plain arpeggio line into something more interesting.
There’s no single correct fingering for this — try different positions and octaves, and record or loop the chords (or use a backing track) so you can hear the line against the harmony. Experiment with playing it both straight and swung.
Finally, it’s worth bringing in some chromaticism. Everything covered so far has been diatonic — built only from notes within the key and each arpeggio. Chromaticism introduces notes outside the key, often filling in the gaps between diatonic notes with consecutive semitone movement. Used well, it adds colour and tension, particularly when approaching a diatonic note or chord tone.
Still in Bb major, try adding chromatic notes into the line for extra flavour and movement while keeping it melodic and clearly outlining the progression. Push your ear further by experimenting with more chromatic choices to really open up the sound of the II-V-I. Beyond this, there’s a whole world of substitution and superimposition techniques for layering more complex sounds over these chords
