Gemini Knows Music

Out of the blue, I felt like making a track, so I stayed up all night and put one together.

It felt a bit lonely to have nobody listen to it, so I tossed the following prompt to Gemini (the AI), and was surprised to get back an almost flawless response.

Apparently this track was created with a certain weather, temperature, geography, and time of day in mind. Can you figure it out? Please conduct a detailed analysis and provide your reasoning.

Give it a thought yourself if you like.

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Overall Conclusion#

This track was likely created with the following scene in mind: “At dusk on a stormy day with thick dark clouds hanging low and thunder roaring, a historic decisive battle is about to begin at an ancient castle or fortress surrounded by rugged mountains.” In the biting cold air, heroes steel themselves with grim resolve—it appears to depict an intensely dramatic moment.

Below is a breakdown of the analysis by element and the reasoning behind it.

Detailed Analysis and Reasoning#

1. Geography: Rugged Mountain Ranges, Ancient Castles, Battlefields#

• Reason 1: Grand Sense of Scale The heavy, multi-layered sound of the full orchestra and choir evokes a strong vertical sense of scale—such as towering, rugged mountains or massive castle walls—rather than a horizontal expanse like a plain. The overwhelming thickness of sound brings to mind both a majestic yet harsh natural environment and colossal structures.

• Reason 2: Timbres Evoking History and Conflict Heroic fanfares from horns and trombones, combined with the powerful resonance of the timpani, strongly evoke settings of historical conflict, such as medieval European ancient castles, fortresses, or legendary ancient battlefields. The harpsichord-like timbre starting from 0:56 further accentuates the classical, medieval atmosphere.

2. Weather: Storm, Dark Clouds, Thunder#

• Reason 1: Tension and an Ominous Air The ground-crawling resonance of low strings and timpani from the very beginning of the track evokes the ominous calm before a storm and the rumble of thunder echoing in the distance. The prevailing minor-key melody seems to depict a sky veiled in thick dark clouds that block out the sun.

• Reason 2: Fierceness and Chaos As the track builds toward its climax, the rapid string passages can be interpreted as howling winds, and the thunderously struck percussion as a violent thunderstorm. The sacred resonance of the female choir also hints at dramatic shifts in the weather, like beams of light occasionally breaking through the clouds.

3. Temperature: Low, Chilly#

• Reason 1: Sharp, Tense Sound The piercing timbre of the brass and the tension-laden melody played by the strings bring to mind biting cold air rather than a warm, gentle climate. Rather than heat or humidity, the sound evokes a crisp, clear, yet severe chill.

• Reason 2: Tragic Pathos and Solemnity The tragic pathos and solemn atmosphere dominating the entire track harmonize far better with a chilly climate that sharpens the mind than with warm weather. The low temperature seems to symbolize the harsh circumstances the characters find themselves in.

4. Time of Day: Dusk (Twilight), or Before Dawn#

• Reason 1: Contrast Between Light and Dark While the track maintains a dark tone throughout, there is also a heroic sense of exhilaration within it. Rather than midnight when the sun has completely set, this suggests a transitional time where light and darkness clash—such as dusk (twilight) with the last remnants of light lingering in the sky, or before dawn when the first light begins to surface through the darkness.

• Reason 2: A Structure That Hints at a Beginning The dramatic progression of the structure—moving from a quiet intro toward a grand climax—strongly instills a premonition that “something is about to begin.” This feels most fitting for a boundary hour: either dusk, marking the end of the day and the beginning of the night, or before dawn, heralding the end of the night and the start of the decisive battle.

The opening summary—“At dusk on a stormy day with thick dark clouds hanging low and thunder roaring, a historic decisive battle is about to begin at an ancient castle or fortress surrounded by rugged mountains”—is pretty much spot-on.

As essential background, this is an arrangement of “Skies Beyond the Clouds” (Ungai Souten) from Touhou Scarlet Weather Rhapsody. It’s the BGM that plays during the pre-battle trash-talk with Iku Nagae, whom you fight right before the final boss (on most character routes).

Since it’s set one stage before reaching Bhavaagra (Heaven), the geography being rugged mountains is correct. Since you could call it Iku Nagae’s sub-theme, the weather being thunder and lightning is dead-on. The temperature isn’t explicitly mentioned, but since it’s halfway up a desolate mountain, it’s probably cold. Correct. The time of day is unspecified, but the premonition that “something is about to begin” is dead-on.

When arranging it, since the scene is deep in the mountains shrouded in fog and dark clouds, I had in mind:

• Ace Combat 04 Safe Return
• Ace Combat ZERO Glatisant

(or rather, straight-up ripping off the electronic bleeps from Glatisant), while also lifting motifs from:

• Ace Combat 7 Magic Spear I

and using them in the low end to bring out the feeling of not being above the clouds yet. Since the shift from Magic Spear I → II feels like it gives a higher-altitude vibe, my plan was to make a “Magic Spear O”.

While its comments on the instruments used were pretty questionable, the overall thematic side of things was so absurdly accurate it shocked me. I renamed the file to Unknown.mp3 before handing it over, so there shouldn’t have been any leakage.

Just in case, I fed it other tracks with the exact same prompt, and it gave properly different responses, so it doesn’t seem like it was just being led along by the prompt either. For example, for a track I wrote imagining a clear, high-altitude sky, it gave me this comment:

This track most strongly evokes the scene of “flying through clear, cold air at extremely high altitudes, experiencing a magnificent sea of clouds and sunlight emerging with the dawn.”

Leave it to Gemini—it really lives up to its multimodal selling point. It made me feel the potential of LLMs.