Trailer music is defined by its shape. It starts small and uneasy, climbs, and arrives at a moment of impact, often more than once. A prompt that only names instruments, such as 'orchestral, choir, big drums', tends to produce something that sounds cinematic but does not go anywhere, which is the one thing a trailer cue cannot afford.
This guide covers the arc, the vocabulary that steers it, prompts for common trailer moods including Indian period dramas, cue lengths, and how to fit the result to your edit.
The three-act shape of a trailer cue
Most trailer cues follow a version of the same arc. Describe it in order and the track has a timeline to follow.
- Act one, tension: sparse and quiet. A low string drone, a ticking pulse, a lone piano note, a soft synth bed. Room for dialogue.
- Act two, rise: a repeating figure (an ostinato) in strings or synth, percussion entering, brass swelling, each section a little denser than the last.
- Act three, impact: the full orchestra, big drums and choir, with large hits on the key moments, then often a sudden stop before the title card.
Vocabulary that helps
Specific trailer terms steer better than generic words like 'epic' and 'dramatic'. Tempos vary widely: pulse-driven action cues often sit somewhere around 100-140 BPM, while emotional cues may barely have a beat.
- Braam: the low, sustained brass-and-synth blast heard in many modern trailers.
- Ostinato: a short repeating rhythmic or melodic figure that builds tension.
- Riser: a rising pitched or noise sound that leads into an impact.
- Hit or impact: a big percussive downbeat marking a key moment.
- Taiko and ensemble drums: deep, heavy drums that drive the climax.
- Choir: wordless or Latin-style vocal layers for scale. Leave it out if you need a strictly vocal-free track.
- Pulse: a steady synth or string heartbeat under the tension section.
Copy-ready trailer prompts
Switch on Instrumental only, then paste one of these into the style box. You can also start from the Cinematic / Epic genre preset. A prompt steers the arc but does not guarantee every hit lands where you want it on every take, so generate more than one.
- Cinematic action trailer, sparse tense opening with low string drone and ticking pulse, building string ostinato and rising brass, full orchestra with taiko drums and big hits at the climax, sudden stop
- Horror trailer, eerie music box melody, dissonant strings, long silences, deep braams, sharp stinger hits, unsettling
- Emotional drama trailer, solo piano opening, strings slowly join, warm build, soaring full orchestra in the final third, hopeful
- Indian historical epic trailer, shehnai and low strings opening, pakhawaj and dhol ostinato building, brass and choir, massive orchestral climax, royal and grand
- Sci-fi hybrid trailer, pulsing synth bass, glitchy percussion, rising synth risers, orchestral and electronic impact, cold and vast
- Thriller teaser, 30 seconds, minimal pulse, one big riser into a single impact and silence
Step by step in Autunes
Everything runs in the browser at www.autunes.com. New accounts get 15 credits once, enough for one track.
- Open the song creator, switch on Instrumental only, and pick Cinematic / Epic or type your own style.
- Describe the arc in order: opening, rise, impact, ending.
- Choose Zori5.5 XL (15 credits) for the fullest orchestral sound on a paid plan, or Zori5 Turbo (10 credits) for drafts. Free-plan instrumentals run on Turbo.
- Generate. A track is usually ready in 2-4 minutes. Songs run up to 3 minutes on Free and Pro and up to 5 minutes on Creator.
- For a teaser or social cut, short-form audio makes 15, 30 or 60 second pieces for 2, 3 or 5 credits.
Cue lengths and cutdowns
Trailers often need several lengths: a 30-second teaser, a 60-second spot and a two-minute full trailer. A full cue within the standard song length covers the long version. For the shorter ones, either generate each as its own short-form piece, so each has a complete arc, or edit down the full cue in your video editor.
Long Forms, on Pro and Creator, runs up to about 12 minutes, but it is built for long sung texts such as chalisas and qawwalis rather than instrumental cues, so it is not the tool for trailers.
Fitting the music to your picture
AI will not know where your cuts fall. Pick the take whose arc is closest, then edit the music to the picture: line up the biggest hit with your strongest shot, trim the tension section to fit the dialogue, and end on a hit or a hard stop before the title.
In Studio, a variation (5 credits) on a selected section changes only that part, which is how you get a bigger climax without touching the opening. Choose Subtle, Fresh take or Reimagine. The free plan includes one variation; Pro and Creator are unlimited. Cut, on Pro and Creator, removes a passage and joins the sides with a crossfade, useful for shortening the middle.
On Pro and Creator, stems (5 credits) split the track into drums, bass, guitar, piano, other and vocals, so you can drop the percussion under dialogue or layer your own whooshes and impacts. Layer Studio adds an instrument such as strings for 5 credits a layer.
Where to use it, and the licence
Trailer cues end up in short films, YouTube channel trailers, game and app promos, wedding film teasers and ads. Free-plan tracks are for personal use; the ₹9 single-song licence adds the download and commercial use of that track forever. Pro (₹599 for 30 days) and Creator (₹2,999 for 30 days) give a commercial licence on every track, covering films, ads and client work, with no royalty and no credit to Autunes. Paid plans add a creation proof with a fingerprint and timestamp, useful when a client asks where the music came from.
Describe a mood, not a film. Asking for music that copies a known film score or theme is a copyright problem, and the result is better when it fits your story.
Common mistakes
- Listing instruments without describing the build.
- Starting too loud, so there is nowhere to rise to.
- Expecting the hits to line up with your edit automatically.
- Adding choir to a track that must be vocal-free.