This brief uses absence as part of the arrangement. A heavy entrance feels larger when it follows a passage that did not spend the same amount of energy. Let the guitar sustain long enough to become part of the atmosphere, and do not fill every gap with another percussion hit.
Illustrative creative brief. No audio test or listening verification is claimed. Load the example explicitly; saved lyrics and directions remain untouched.
doom metal with dark ambient space, 65 BPM, F minor, instrumental, sparse half-time drums, downtuned sustained guitar, low drones, metallic resonance, long decays
blast beats, bright lead melodies, vocals
The full sound brief
A slow instrumental built from doom-metal guitar weight and dark-ambient space. Use a 65 BPM half-time pulse only in the main passages. Let low drones, long guitar decay, and metallic room resonance fill the gaps. The drums should arrive deliberately, not constantly. Avoid blast beats, bright lead melodies, and vocals.
Give each genre a role
Doom metal supplies the riff weight and the slow pulse when drums are present. Dark ambient supplies the unmetered stretches, resonances, and sense of surrounding space. The brief deliberately avoids asking for a continuous drum part throughout the whole track.
Resolve the tension
A beatless layer and a metered layer can coexist in the app's planning model, but that does not solve the arrangement automatically. The more important instruction is where the pulse enters and leaves. Also keep the low drone subordinate to the guitar or bass when all three occupy a similar register.
Plan the arrangement
Begin with a single low resonance. Reveal the guitar without drums, then allow the half-time pulse to arrive after the motif is established. Remove the kit for the central passage and keep only a fragment of the riff. Bring back the original pulse with one additional texture, then let the final chord decay into the drone.
Refine one decision
When the piece is dense from its first second, ask for a longer sparse opening rather than simply making the entire prompt darker. When the drums become too fast, specify isolated half-time accents and remove any language implying relentless drive. Keep the guitar weight that was already working.
Two variations to compare
instrumental doom and dark ambient, 65 BPM, isolated half-time drum hits, sustained downtuned guitar, low drone, long silence between phrases
instrumental doom metal, 65 BPM, slow recurring riff, sparse heavy drums, dark ambient interludes, metallic room decay
What to listen for in your result
Notice whether silence and decay are doing audible work between entrances. The intended climax should feel heavier than the opening because the arrangement earned it, not merely because every element is loud throughout.