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How a Song Gets Made: From a Hummed Idea to the Track in Your Earbuds

In 1965 Paul McCartney woke up with a complete melody in his head and spent weeks asking people whether he'd stolen it from somewhere. Until he had real words, he sang it as "Scrambled eggs, oh my baby how I love your legs." It became "Yesterday." Fifty-odd years later, Billie Eilish and her brother Finneas made an album in his small bedroom studio in Los Angeles that won Album of the Year at the 2020 Grammys.

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Between those two stories, almost everything about the technology changed. The basic path did not. Every recorded song passes through the same five stages: writing, arranging, recording, mixing and mastering. Know them, and you'll hear choices in every track that you used to hear as "just the song."

The five stages, in order:

  1. Write — the song
  2. Arrange — the parts
  3. Record — the takes
  4. Mix — the balance
  5. Master — the final polish

Then the song is released.


1. Writing: the song itself

A song is the part that survives any performance: melody, chords, lyrics and form. You could sing it on a bus with no instruments and it would still be that song.

Most popular songs are built from a few repeating sections:

Section Job
Verse Tells the story; new words each time, same music
Pre-chorus Builds tension, lifts toward the payoff
Chorus The hook; same words each time, the part everyone sings
Bridge A contrast near the end, so the last chorus feels earned

Songs start anywhere: a melody in a dream, a title, a chord loop on a guitar, a beat on a laptop. Many professional songs today are co-written, with one person on lyrics, another on melody, a producer building the track as they go. The line between "writing" and "producing" has blurred.

2. Arranging: who plays what

The same song can be a solo piano ballad, a punk thrash or a dance track. Arrangement decides the instruments, the tempo, the key, the groove, and when each part enters and drops out. Good arrangers think in layers and in space: a part that plays everywhere is a part nobody notices.

Listen for this in your next favorite song: what's playing in the first verse, and what's added for the chorus? Often the chorus feels bigger simply because the drums open up, a bass line doubles, or backing vocals arrive.

Arrangement is the art of deciding what not to play. Space is what makes the important part sound important.

3. Recording: capturing the takes

Early records captured a whole band at once, through a single horn and later a single microphone. Then came magnetic tape and, with it, multitrack recording: each instrument on its own track, recorded separately and layered.

The Beatles' Sgt. Pepper's Lonely Hearts Club Band (1967) is a famous example of squeezing that system. It was recorded at EMI's studios on four-track machines over roughly five months, with engineer Geoff Emerick estimating around 700 hours of work. To get more than four parts, they mixed several tracks down onto one ("bouncing") to free up space, and for "A Day in the Life" two machines were synchronized to fit the orchestra.

Today a laptop can hold hundreds of tracks. That freedom brought new habits:

  • Overdubbing: adding parts one at a time on top of earlier ones.
  • Comping: recording a vocal many times and stitching together the best phrases into one "composite" take.
  • Editing: nudging drums into time, tuning notes, cutting breaths. Done lightly, nobody hears it. Done heavily, it becomes a style.

4. Mixing: making it one sound

A mix engineer takes dozens of separate tracks and blends them into a single stereo picture. The main tools are surprisingly few:

  • Balance: how loud each part is relative to the others.
  • Panning: where each sound sits from left to right.
  • EQ (equalization): boosting or cutting frequency ranges so instruments don't mask each other; for example, trimming low rumble from a guitar so the bass has room.
  • Compression: narrowing the gap between a part's loud and quiet moments, so a vocal stays present.
  • Reverb and delay: artificial space, from a small room to a cathedral.

Mixing choices can define an era. The huge, cut-off drum sound of the 1980s, called gated reverb, emerged at London's Townhouse Studios around 1980 while engineer Hugh Padgham recorded Phil Collins drumming for Peter Gabriel. Padgham said he found it by accident through a heavily compressed talkback microphone, though producer Steve Lillywhite has said he was experimenting with the idea earlier. Collins then made it famous on "In the Air Tonight."

5. Mastering: the final polish

Mastering is the last step: a separate engineer, ideally with fresh ears and a very accurate room, makes small adjustments to the finished mix (overall tone, loudness, spacing between tracks) so it translates to earbuds, car speakers and club systems alike.

Mastering is also where the loudness war was fought. Because louder often sounds "better" at first listen, from the CD era on, masters were squeezed with heavy compression and limiting to sound louder than the competition. Critics say it flattened the music's dynamics. A turning point in public attention was Metallica's Death Magnetic (2008), whose CD was mastered so loud it audibly distorted; fans noticed that a version made for the game Guitar Hero III sounded better.

Streaming changed the incentives. Most services now turn every track to a similar loudness. Spotify's default target, for example, is −14 LUFS (a standard measure of perceived loudness), and it turns louder masters down to match. Squashing a master no longer makes it louder on Spotify; it can just make it flatter. Engineers still master loud for other reasons, so the war isn't entirely over.


What changed, and what didn't

Then (1960s) Now
Expensive studio, booked by the hour A laptop, headphones and one good microphone
Four to eight tracks Effectively unlimited tracks
Performances captured largely whole Performances often assembled from pieces
Engineers, producers and artists in separate roles One person often writes, produces and mixes

What hasn't changed: a song still needs a reason to exist, a part you remember, and someone deciding what to leave out.


The takeaway

Every track you hear has been written, arranged, recorded, mixed and mastered, and each stage leaves fingerprints. The song is the melody and words; the arrangement is who plays what and when; recording captures it; mixing balances it into one picture; mastering prepares it for every speaker. Technology moved the whole process from big studios to bedrooms, but the decisions are the same.

Try this: play a song you know well on good headphones and listen four times, once for each layer: only the drums and bass, only the vocals, only what is panned hard left or right, and only what changes when the chorus arrives. You'll hear the arrangement and the mix as clearly as the tune.


Sources & Further Reading

Sources
- Wikipedia's sourced articles on "Yesterday" (dream origin, "Scrambled Eggs," June 1965 recording), When We All Fall Asleep, Where Do We Go? (Finneas's Highland Park bedroom studio; Grammy Album of the Year, 2020) and Sgt. Pepper's Lonely Hearts Club Band (four-track recording, reduction mixing, Emerick's 700-hour estimate).
- Wikipedia, "Audio mixing (recorded music)" and "Gated reverb" (Padgham, Collins, Gabriel; Lillywhite's competing claim).
- Wikipedia, "Loudness war" (Death Magnetic, streaming loudness targets).
- Spotify for Artists, "Loudness normalization" (−14 LUFS default; louder masters turned down).

Go deeper
- 📘 Behind the Glass — Howard Massey (interviews with record producers about how hits were actually made)
- 📘 Mixing Secrets for the Small Studio — Mike Senior (the clearest practical guide to mixing at home)
- 🌐 Spotify for Artists: loudness normalization (why loudness targets matter)
- 🌐 Related pieces in this library: How Recording Changed Music · How to Actually Listen


For Your Vocabulary

Arrangement (the choice of instruments and parts, and when each plays) · Multitrack Recording (recording instruments on separate tracks to be combined later) · Overdub (a part recorded on top of existing tracks) · Comping (assembling the best sections of several takes into one) · Panning (placing a sound between the left and right speakers) · EQ (adjusting the balance of frequencies in a sound) · Compression (reducing the difference between loud and quiet moments) · Mastering (the final preparation of a mix for release) · LUFS (Loudness Units relative to Full Scale, a standard measure of perceived loudness)