The issue is not only speed
After picture lock, music stops being a mood board decision. It has to land inside an approved edit, respect voiceover space, survive multiple cutdowns, clear for the right usage and pass the final mix. The risk is not simply choosing the wrong track. The risk is approving something that sounds persuasive in a review link but cannot be licensed, adapted or delivered.
That happens often in advertising. The hero film is approved. Social versions are being prepared. The end card is locked. Someone says the music can be sorted later. It can, but the process has to become more disciplined.
The commercial question is practical: how do you find music after picture lock without reopening the film?
Define the production box first
Before listening, write down the constraints. Exact duration, cutdowns, placements, territories, licence term, paid media, organic social, TV, cinema, events, voiceover, legal supers, packshot timing, sonic logo requirements, mix date and delivery specs.
Platform specs matter. Google Ads lists different video asset requirements across YouTube placements, including horizontal, vertical and square formats, plus short formats such as 6 second bumpers and Shorts. A track chosen only against a 16:9 master may fail when the campaign becomes a 9:16 edit with a much earlier hook.
Loudness also matters. EBU R 128 remains a key European reference for loudness normalisation and true peak management. In France, the television advertising decree also states that advertising sound levels must not exceed the average sound level of the surrounding programme. A heavily mastered track may impress in a presentation, then lose impact or create compliance issues in the final mix.
The three realistic routes
Route one is licensing an existing commercial track. It can bring instant cultural meaning, but it requires precise clearance. The U.S. Copyright Office explains that a recorded song may involve two separate protected works: the musical work and the sound recording. For advertising, that usually means checking the publisher side, the master side, featured performers, brand conflicts, territories, media and term.
Route two is production music. It can be fast and effective when the catalogue terms are clear and the files are genuinely usable. The trap is assuming that every library track is editable. For locked picture, you need more than a stereo file. You need stems, alternative mixes, button endings, no lead versions and sometimes a short sonic logo.
Route three is original composition. It can be the cleanest route when time is short, because the music is written to the approved picture. A composer can avoid the voice, hit transitions cleanly, create a distinct brand gesture and deliver the required versions from the same material.
For earlier decision making, see https://www.sultasto.agency/blog/original-score-vs-production-music-advertising and https://www.sultasto.agency/blog/original-music-budget-rights-deliverables.
A concrete example: the 30 second film that becomes 6
Imagine a 30 second beauty film. The product benefit lands at 8 seconds. The tactile product gesture appears at 14 seconds. The packshot arrives at 25 seconds. After approval, the media plan adds a 6 second bumper and several vertical social edits.
A licensed pop track may work in the 30 because the chorus arrives near the end. In the 6, it never gets there. A flexible original cue, or a well prepared catalogue cue, can solve the problem differently: tactile attack on frame one, a thin harmonic bed under the line, a small lift into the product gesture and a short final mark for the brand.
The question is not whether the music is impressive on its own. The question is whether it still communicates when the film is shortened.
What to ask for immediately
After picture lock, the brief should be technical as well as emotional. Send the film with timecode, voice script, usage, territories, term, media plan, mix date, reference direction and any legal restrictions. Do not ask for dozens of speculative directions. Ask for options that can actually clear and deliver.
Request deliverables before approval: full mix, instrumental, no lead, no drums if useful, separated stems, sting, button ending and cutdowns. For more on this delivery stage, see https://www.sultasto.agency/blog/audio-stems-cutdowns-versioning-ad-campaign-2026-10-08.
Clearance should run beside creative review. Sacem documentation notes that a video using repertoire music and associated with a brand or advertising purpose can require prior publisher authorisation for certain online uses. The point is broader than France: do not present a track as approved until the rights path is real.
The serious limitation
Music cannot fix every locked edit. If the film has no hierarchy, if the voiceover fills every second, or if each shot asks for a different emotion, music will either flatten the film or fight it.
Sometimes the stronger solution is smaller: a held tone, a two note motif, a designed impact, or silence. For the boundary between score and sound design, see https://www.sultasto.agency/blog/music-sound-design-postproduction-2026-10-07 and https://www.sultasto.agency/blog/silence-publicite-mix.
Fast decisions still need structure
A good late stage music process has four moves. Lock the rights and delivery constraints. Listen only to viable options. Test the music in every required version. Deliver stems and cutdowns before the final mix closes.
When picture is locked, the best music partner is not the one who sends the longest playlist. It is the one who can read the edit, protect the rights position, work with the mix and keep the campaign deliverable.
If a commercial is already locked and the music is still unresolved, Sul Tasto can help assess the realistic routes: original score, supervision, adaptation, stems and delivery.