Udio cinematic epic score for a trailer

Style box: cinematic epic trailer score, hybrid orchestral + modern percussion, [MOOD — see mapping below], ~[BPM — see mapping] BPM, key of [KEY — minor keys for tension/drama, major for triumph/hope], [INSTRUMENTATION — see frequency guide], building intensity, film-trailer production, no vocals (instrumental).

Structure (paste into Udio's lyrics/structure box):
[Intro] — sparse, atmospheric, a single motif (piano or solo cello), sub-bass drone establishing key
[Build] — add pulsing ostinato strings + soft snare rolls, rising tension, introduce the main melodic fragment
[Hit] — first big braam/impact hit + full percussion drops in, 1-bar silence after for weight
[Main Theme] — full orchestra + choir, the heroic/emotional statement of the theme, brass leads
[Breakdown] — strip to solo instrument + heartbeat percussion, contrast creates anticipation
[Climax] — everything together at peak intensity, fastest percussion, biggest brass, choir at full force, cymbal swells
[Outro] — one final massive hit, 2-second ring-out, then silence. Clean tail, no fade.

Frequency spectrum guide — every trailer cue needs all three layers:
• **Sub-bass (20–80Hz)**: the PHYSICAL layer. Sub-bass drones, impacts, and braams create visceral tension you feel in your chest. Essential for [Hit] and [Climax]. Use sparingly in [Build] or it peaks too early.
• **Mid-range (200Hz–2kHz)**: the HEROIC layer. Brass (French horns, trombones), cello sections, and choir live here. This is where your main theme melody sits. If the mid-range is weak, the cue sounds impressive but not memorable.
• **High-end (4kHz+)**: the EMOTIONAL layer. High strings (violins tremolo), soprano choir, and metallic percussion (crotales, glockenspiel) add shimmer and emotion. Too much = shrill. Too little = dull and muddy.

Tempo-to-mood mapping:
• 60–75 BPM: dread, weight, inevitability (think Inception, Interstellar)
• 80–95 BPM: tension, building menace, dark heroism (think The Dark Knight)
• 100–120 BPM: action, urgency, adventure (think Avengers, Mission Impossible)
• 130+ BPM: frenzy, chaos, overwhelming force (think Mad Max: Fury Road)
• PRO MOVE: start the [Intro] at half-tempo, then double it at the [Hit] for a gear-shift effect.

Mix reference technique: In the style box, add a reference like 'mix and production quality of [REFERENCE — e.g., Hans Zimmer Inception trailer / Two Steps From Hell Victory / Audiomachine Blood and Stone]'. This steers Udio's production choices more than describing individual instruments.

Udio stitching workflow:
1. Generate the [Intro] through [Build] as one clip (~30s). Generate 3–4 takes, pick the one with the best motif.
2. Use that clip as the input and 'Extend' from its end to generate [Hit] through [Main Theme]. The extend feature preserves key/tempo continuity.
3. Extend again for [Breakdown] through [Outro].
4. If any section is weak, re-generate just that section using the surrounding clips as context.
5. Final assembly: stitch the best sections in a DAW (even free ones like Audacity). Add a tiny crossfade (50–100ms) at each stitch point.
6. Total target length: 60–90 seconds for a trailer cue. Shorter = tighter impact.

Tips: always specify 'instrumental' AND 'no vocals' — Udio likes to add phantom vocals otherwise. Minor keys (D minor, C minor, G minor) are trailer-score workhorses. Generate in 32-second chunks for maximum quality. If the output sounds thin, add 'layered, dense orchestration, wide stereo mix' to the style box.