Tutorials Audio

Tempo Maps and Hit Points: Writing Music to Land on Picture

Intermediate · ~16 min

Overview

Music working with picture usually arrives somewhere on purpose. A cymbal on the cut, a chord under a look, silence a beat before a door closes. Getting there reliably is a technical problem with a well-established solution: a tempo map built around the moments you want to hit, decided before you write the melody. Composers new to picture work usually write first and try to line it up afterwards, which is where the fight starts.

What You Need

A locked or near-locked edit, with a note of any sections still moving
A sequencer supporting a tempo track and markers, which is all of them
Timecode burned into the picture, or a shared start reference both ends agree on
A list of the moments the director wants supported, in their words rather than yours

Steps

Spot the cue before you write a note

Watch the scene with the director and write down every moment music has to acknowledge, with its timecode. This is a spotting session, and its output is a list rather than a feeling. Mark which entries are hard, meaning the music has to land there, and which are soft, meaning support is welcome but the timing has room. Composers who skip this write beautiful cues fitting nothing.

Import the moments as markers, not as memories

Put a marker in your sequencer at every timecode from the spotting list, labelled with what happens there. Now the picture edit exists inside your session as data rather than as something you rewatch. When the edit changes and a moment moves by eleven frames, you move one marker and see immediately what the change costs you musically.

Choose the tempo from the hits rather than from taste

Two hard hits and the gap between them determine your tempo options. Divide the gap in seconds into beats and see which tempos put a strong beat on both ends. A gap of 8 seconds takes 120 beats per minute at 16 beats, or 90 at 12 beats. Pick from the list of tempos landing your hits, then write within the one feeling right. Choosing a tempo first and hoping is how a cue ends up four frames late for its whole length.

Bend the tempo where a single tempo will not reach

Cues with several hard hits rarely accept one tempo across the whole length. The tempo track exists for this. A gradual change of two or three beats per minute across eight bars is inaudible as a change and buys you the frames you need. A sudden jump is audible and reads as a mistake unless the picture cuts at the same moment, where it reads as intent. Put your tempo changes on cuts and nobody hears them.

Decide what a hit means musically before you place it

A hit is not always an accent. Landing every moment with a stab produces a cue sounding like a cartoon. The strongest options are often the quiet ones: a harmonic change under a realisation, the removal of an instrument at a door closing, or silence arriving a beat early so the sound effect owns the moment. Decide the musical gesture first and the placement second.

Protect yourself against the edit changing

The edit will change after you start. Build so a shift costs you minutes rather than a rewrite. Keep your cue in sections with clear seams, avoid writing long unbroken material across a hit, and keep the tempo track simple enough to reason about. Ask for a change list rather than a new export, because knowing a scene lost 14 frames at 01:12:04 tells you exactly which markers moved.

Deliver against timecode, not against a file start

Your cue lands in someone else's session. Deliver stems starting at a known timecode rather than trimmed to the first note, name every file with the cue number and the start time, and include a note of the frame rate you worked at. A cue arriving perfectly written and one frame out because the two ends assumed different frame rates costs an afternoon to find.

Pro Tips

Work in frames rather than seconds when you talk to the picture department. Half a second means nothing to an editor and twelve frames means something exact.
Confirm the frame rate in writing at the start. A 23.976 against 24 mismatch drifts slowly and reads as sloppy playing rather than as a technical fault.
Ask which moments the director would keep if only two survived. A list of thirty hits is a list of no priorities.
A hit landing slightly early usually feels intentional. A hit landing slightly late always feels like a mistake, so err forward when a frame is in question.
Keep a click track in your delivery even when the cue is free in feel. Anyone conforming the cue later will need it.
Name cues with the reel and a number, such as 2M4, rather than with a title. Titles change and the numbering survives the whole production.

Knowledge Base

What You'll Learn

The table below covers the arithmetic behind choosing a tempo. The sections after it cover the two decisions separating a cue fitting the picture from one fighting it.

Tempo arithmetic for a gap between two hits

Gap	8 beats	12 beats	16 beats	24 beats
4 seconds	120 bpm	180 bpm	240 bpm	360 bpm
6 seconds	80 bpm	120 bpm	160 bpm	240 bpm
8 seconds	60 bpm	90 bpm	120 bpm	180 bpm
10 seconds	48 bpm	72 bpm	96 bpm	144 bpm
12 seconds	40 bpm	60 bpm	80 bpm	120 bpm

The arithmetic is beats divided by seconds, times sixty. Read across each row and one of the results usually sits in the range the scene wants, which is the tempo to write in. Where none does, the answer is a tempo change rather than a compromise on the hit.

Bending the tempo against moving the moment

When music and picture disagree, one of them moves. Knowing which is a judgement worth making deliberately rather than by default.

Bend the tempo when the hit is hard, the moment belongs to the picture, and the music has room to breathe. A ritardando of a few beats per minute across several bars is invisible, and it is how most cues reach a moment they were never going to reach at a fixed tempo.

Ask for the picture to move when the cut is soft, the music is doing something structural, and shifting a shot by half a second costs the edit nothing. Editors often say yes to this, and composers often forget to ask. The conversation is cheap and the alternative is writing around a problem nobody wanted to keep.

Move neither when the moment is better served by silence. A hit missed on purpose, with the music stopping a beat before, frequently plays stronger than the same moment landed exactly.

Why free-time sketching costs you later

Writing a cue with the tempo left at the default and the picture running underneath feels faster at the start. Every minute saved there is repaid with interest when the cue has to line up.

A cue written in free time has no relationship between its bars and the picture. Making it hit later means either stretching audio, which degrades it, or rewriting against a tempo map, which is the work avoided at the beginning. Neither is quick, and both arrive at the point where a director is waiting.

The habit worth building is short: markers first, tempo second, notes third. Ten minutes of setup makes every later edit change a small adjustment rather than a decision about whether to start again.

Where This Fits

This sits under Scoring for Picture, the pillar covering the composer workflow end to end. Orchestral Mockups covers making the written cue sound convincing before anyone records it, and Mixing a Full Song covers the mix habits carrying over into stems.

FAQ

Q: What is a tempo map?
A: A record of how the tempo changes across a cue, held in your sequencer as a track of its own. It lets the music reach specific moments in the picture while staying in bars and beats, so everything stays editable and playable.

Q: What is a hit point?
A: A moment in the picture the music has to acknowledge, such as a cut, a look or an impact. Hard hits have to land exactly. Soft hits welcome support but tolerate a few frames either way.

Q: How do I work out the tempo for a gap between two hits?
A: Divide the number of beats you want between them by the gap in seconds, then multiply by sixty. Try several beat counts and pick whichever gives a tempo suiting the scene.

Q: Is it better to change the music or ask for a picture change?
A: Bend the tempo when the moment belongs to the picture. Ask for a picture change when the cut is soft and the music is doing something structural. Editors say yes more often than composers expect, and asking costs nothing.

Q: What happens when the edit changes after I have written?
A: Ask for a change list rather than a fresh export. Knowing a scene lost fourteen frames at a given timecode tells you which markers moved and how far, which is a small adjustment rather than a rewrite.