Song Arrangement: Energy and Structure

A lot of producers have a folder full of eight-bar loops that sound good and never become tracks. The problem rarely comes from a lack of ideas. A loop repeated for three minutes, however beautiful, simply ends up having nothing left to say. Arrangement is the art of making what you already have evolve over time: who plays, when, and how intensely.

Eight-bar blocks

Electronic music is almost always built in blocks of 8 bars, and their multiples, 16 and 32. It isn't a law, but the habit is so widespread that listeners' ears, and the ears of the DJs who mix your tracks, expect something to change at the start of every block. The two-bar and four-bar phrases you wrote in the previous lessons fit into them naturally: two four-bar phrases make an eight-bar block.

Each block gets a role, which we call a section. Here are the most common ones, with what you usually find in them.

These words don't describe rigid formulas. A techno drop can have no melody at all, and an electronic pop chorus can be an instrumental drop. What defines a section is its role in the story of the track and its energy level.

The energy curve

Picture your track as a curve that rises and falls over time. Energy is what the listener feels: how dense the elements are, how strong the rhythm is, how present the low end is, how bright the sound is. A track that stays at the same level from start to finish gets tiring or boring; a track that alternates climbs, peaks and breathers holds attention.

Here's an original plan, in the spirit of a club track, with an energy level rated from 1 to 5 for each section.

Look at the energy column: two peaks, separated by a valley. The breakdown is part of the climb, since it's what makes the second drop hit harder than the first. Contrast counts for more than the absolute level: a drop feels huge because what came before it was held back.

Adding and removing

The basic move in arrangement is simple: add an element, or take one away, at the start of a block. Many producers follow one principle: every 8 bars, something changes, even subtly. A layer of hi-hats comes in, a bass stops, a pad opens up, a motif varies its ending.

People often think of adding, but removing is just as powerful. Cutting the kick and the bass a few bars before the drop creates a gap, and bringing them back on the first beat of the drop releases all the tension. Listen to two bars of chords and hook, first on their own, as in a breakdown.

Here are exactly the same notes, with a kick, a clap and hi-hats.

Nothing has changed in the harmony or the melody, and yet the energy is in a different world. It's one of the big lessons of arrangement: with the same material, you can write very different sections, just by choosing what plays.

In particular, try muting the kick for one bar, then bringing it back exactly on the first beat: you've just built, in miniature, the kick's return at the start of a drop.

Building tension: rhythm and filter

The build-up has only one goal: to make people want the drop. Two tools dominate it. The first is rhythmic: you increase the density of one element, typically a snare or clap roll that goes from quarter notes to eighth notes, then to sixteenth notes. The tempo doesn't change, but the listener feels as if everything is speeding up. Listen to this idea, condensed into two bars.

In a real track, this acceleration is usually spread over eight or sixteen bars: for example four bars of quarter notes, two of eighth notes, two of sixteenth notes. The principle stays the same, and it works all the better when the last hit lands just before the first beat of the drop, sometimes followed by a short silence.

The second tool is the filter. A low-pass filter lets the lows through and cuts the highs above its cutoff frequency. If you slowly raise that frequency during the build-up, the sound gradually opens up and gets brighter, as if it were coming out of the next room. The other way around, a high-pass filter that takes out the low end during the rise deprives the listener of bass, and the drop gives it all back at once.

People often add a riser, a sound that climbs in pitch or brightness during the build-up, to push the effect even further. All of these moves are programmed with automation, that is, a curve you draw in your DAW to make a setting change over the bars.

Transitions

The move from one section to the next deserves as much care as the sections themselves. The most common transitions sit at the very end of a block, or on the first beat of the next one. A drum fill in the last bar announces the change, and a cymbal or an impact on the first beat confirms it. A silence of one beat or half a bar right before the drop works remarkably well, because the ear then waits for the first beat all the more eagerly.

Transition sounds, like rising noise, a reversed cymbal swelling toward the first beat, or a sound that falls away after the drop, also go on the block grid. Their end or their start has to land exactly on the bar line. Placed at random, they create doubt instead of announcing the change.

Keeping it unified

One last point ties arrangement to everything you've learned in this part. The sections change, but the material stays largely the same: the same chord progression or a variant, the same hook, the same bass. That unity is what makes you hear a track rather than a string of loops.

To vary things without losing the thread, use the tools you've already seen: a variation of the motif, a more syncopated bass in the second drop, an arpeggio that comes in at the breakdown, a melody doubled at the octave for the last pass. For a final chorus, you can also go up a semitone or a whole tone, the modulation you saw in the part on chord progressions.

This lesson wraps up the part on writing. In the next one, we leave the notes behind to look at sound itself, and understand why a sine wave and a sawtooth playing the same note sound so different.