Pedal Points, Drones and One-Chord Loops

Throughout this part, we've kept the chords moving. To finish, let's look at the opposite: what happens when something refuses to move. A note held under a whole progression, a continuous sound, a single chord for several minutes. These are very powerful tools, especially in techno, ambient and build-ups.

A bass that stays put

Let's listen first. In the next figure, four chords follow one another, Am, F, G, then Am, but the bass stays on A2 from start to finish.

This held note is called a pedal point, or simply a pedal. The name comes from the organ, where the organist holds a low note with a foot while the hands keep playing. You heard it: when the chord contains the pedal note, as Am and F do, everything stays calm. When it doesn't, as with G, the bass rubs against the chord, and tension appears, which resolves as soon as Am comes back.

These chords are often written with a slash: F/A means the F major chord with an A in the bass, and G/A means the G major chord with an A in the bass. There's nothing new about the chords themselves: only the bass has stopped following their roots.

The dominant pedal, the engine of build-ups

The most common pedal is on the tonic, as in the previous example: it gives a feeling of stability, of being anchored. But you can also hold the dominant, the fifth note of the scale, which is E in A minor. A dominant pedal creates anticipation that grows with every bar, because the bass itself is calling for the tonic.

Listen to the third bar: the F major chord, over the E in the bass, creates a half-step rub between F and E, the most tense moment in the loop. That's exactly what you're after in a build-up before a drop: a bass that insists on the dominant while the tension rises above it, then breaks free when the tonic arrives with the drop.

The drone, a sound that never stops

A drone goes further than a pedal. It's a continuous sound, often a single note or a fifth, that sounds through a whole section, sometimes through a whole track. It isn't just a bass: it creates a backdrop, a background color against which everything else stands out. You find it in a lot of traditional music, in ambient and in a good share of techno.

Listen to this fifth drone, A and E, played first by a pad, then by a sawtooth wave. The notes are exactly the same: only the timbre changes, and yet the atmosphere is completely different.

Over a drone, a melody takes on a particular depth, because every note is measured against the held note. Some blend with it, others rub. The next figure places a melody in A minor over this drone: listen to how B and F create small tensions, which relax on A, C and E.

A one-chord loop

Many techno tracks, and some house, rest on a single chord repeated for minutes on end. That's not laziness: by refusing to change chords, the track moves the interest elsewhere. The ear, no longer waiting for a change of harmony, becomes very sensitive to everything else: the rhythm, the sound, the small variations.

In the next figure, the chord stays A minor for four bars, over a held A2. Only the top note changes from one bar to the next: E, then G, then B, then E again. The harmony barely moves, but the color evolves.

In a real track, this evolution also happens, and mostly, through the sound: a filter opening slowly over several bars, a rising resonance, a reverb or a delay getting longer, a rhythmic pattern that shifts. These changes in timbre and rhythm play the role that chords play elsewhere: creating tension, then releasing it.

Where to find tension without changing chords

When the harmony stands still, you have three main levers. First, the melody: a note that rubs against the chord or the drone creates tension, and a chord tone releases it. Next, the rhythm: tighter notes, a syncopation, a pattern that shifts against the beat all give momentum. Finally, the timbre: opening a filter, adding distortion, making a sound wider or brighter raises the energy, and closing it back down lets it fall.

This lesson wraps up the part on chord progressions. In the next part, we'll move on to melody, starting with an essential question: how to write a line that sits well on your chords.