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What is a Suno prompt?
A prompt is the short description of sound that tells the model what kind of song to build before a single note exists.
A prompt is a description, not an instruction
A prompt is the block of text that describes the sound you want. It is not a command the model obeys literally, and it is not a request form. It is closer to the note a producer scribbles before a session: a handful of words that narrow an enormous space of possible songs down to a recognisable corner of it.
Because of that, the useful unit is the descriptive phrase, not the sentence. "Please make me an amazing emotional song that everybody will love" narrows nothing — every word in it is a wish about the listener, not a fact about the audio. "slow indie folk ballad, fingerpicked acoustic guitar, close breathy female vocal, room reverb, 68 BPM" narrows a great deal, because every phrase names something a musician could actually play or a mixer could actually set.
What the prompt controls
- Genre and sub-genre — the stylistic neighbourhood the arrangement is drawn from.
- Instrumentation — which sound sources are present and which are absent.
- Vocals — presence, register, texture and delivery, or the word
instrumental. - Mood and energy — the emotional temperature and how hard the track pushes.
- Tempo and groove — speed in BPM plus the feel (straight, swung, half-time).
- Production character — space, brightness, era, grit, width.
Lyrics live in a separate field. Keeping them separate matters: describing the story of your song inside the style prompt wastes the limited space you have to describe the sound.
Why short beats long
Every prompt has a budget. Past a point, adding words does not add control — it adds contradictions and dilutes the terms that were working. Six precise phrases beat thirty vague ones, and a prompt that names one clear genre centre will hold together far better than one that names four.
Example
Practice
Take a song you already love and write it as a prompt in six phrases or fewer, without naming the artist or the song. Force yourself to cover genre, one or two instruments, the vocal, the mood and the tempo — then read it back and ask whether a session musician who had never heard the original could play something recognisable from your description alone. If any phrase would leave them guessing, replace it with one that would not.