How to make a beat with AI: tempo, genre, structure and stems, from a text brief

Making a beat with AI is a writing job before it is a music job: the model builds the drums, bass and melody from the brief you give it, so a brief that names the genre, the tempo, the drum character and the feel gets a beat, and a brief that says "a good beat" gets a guess. This guide covers the brief, the settings that decide whether the track comes back as an instrumental, the structure that makes a beat usable under vocals, how to pull stems, and how to check the tempo and loop the result. It uses PrismPoster's Music Studio, where an instrumental is a switch rather than a workaround, but the brief-writing applies to any generator.

What goes in the brief for a beat?

Four things decide the result: the genre or reference feel, the tempo in BPM, the drum and bass character, and the mood; add the instruments you want on top and what you do not want, and keep it to two or three sentences.

Element	Weak brief	Strong brief
Genre	"hip hop"	"boom-bap hip hop, dusty sampled drums, 1990s New York feel"
Tempo	(none)	"88 BPM"
Drums and bass	(none)	"swung kick and snare, crisp hats, a deep round sub bass"
Mood	"cool"	"late-night, unhurried, slightly melancholic"
Melody and texture	(none)	"a looped piano phrase and a muted trumpet line, vinyl crackle"
Structure	(none)	"eight-bar intro, sixteen-bar verse sections, a drop-out before each hook"
Avoid	(none)	"no vocals, no orchestral swells, no EDM risers"

Tempo anchors everything. Common ranges: lo-fi 70 to 90 BPM, boom-bap 85 to 95, trap 130 to 160 (felt as half-time, 65 to 80), house 120 to 128, drum and bass 170 to 176. Write the number; it removes the model's biggest guess. The AI music genres guide has tempo and instrumentation cues for each family.

Step 1: set instrumental and length before you generate

In PrismPoster's Music Studio, the instrumental toggle tells the generator to produce no vocals at all, which is different from writing "no vocals" in the brief; the toggle is a hard setting and the brief is a suggestion. Set the target length to what the beat is for: a minute for a loop you will repeat, two to three minutes for a full instrumental. A custom track costs 25 credits, and the Free plan's 150 starter credits cover a handful of candidates. Generate two or three variations from the same brief; the differences between them are usually in the drums, which is where taste lives.

Step 2: shape the structure

A beat for vocals needs space to breathe, which means sections that change every 8 or 16 bars: a stripped intro, a full verse groove, a lift for the hook (an added melody, a wider bass, doubled hats), and a drop-out bar before each hook. Put those words in the brief ("drop the drums for one bar before each hook") and the arrangement follows. At 90 BPM a 4/4 bar is 2.67 seconds, so a 16-bar verse is about 43 seconds and an 8-bar hook about 21; song structure explained has the arithmetic for any tempo, and the BPM tapper gives the bar length from a tapped tempo.

Step 3: pull the stems

The Music Studio returns stems with a track, so the beat is not a single flattened file: the drums can be brought forward, the bass can be muted for a breakdown, and the melody can be dropped under a rap verse and returned for the hook. Stems are also what make the beat usable in an outside editor, where you would otherwise have to fight a mixed file with equalisation. Keep the stems with the project.

Step 4: check the tempo and loop it

A generated beat's tempo can drift a hair from the number you asked for. Tap along with the BPM tapper for ten beats to read the real BPM, then use that figure when you set the grid in an editor. To loop a section, cut on a downbeat at the start of a bar and on the same beat a multiple of four bars later; the join is inaudible when both cuts fall on the "one". The timeline editor handles the loop, and the same timeline takes the vocal on a second track.

Step 5: put vocals on it

Write the verse to the beat's structure: 16 bars, rhyme scheme chosen before the words, the hook on the section where the beat lifts. The rap lyrics generator writes in bars with a marked hook if you want a scaffold, and the song lyrics generator drafts sung sections. If you want the generator to sing the words rather than recording them yourself, generate the whole song instead of a beat: the same brief plus the lyrics, with the instrumental toggle off, produces the track with vocals in one pass, which is the route in how to make a song with AI.

What can you do with a generated beat?

Use it under your own vocals, as the bed for a video, as a stream or podcast intro, or as a loop for a starting-soon screen. What the licence covers, including where generated music can be published and monetised, is set out in AI music licensing explained; keep the generation record and the stems as proof of origin. Choosing between generators by what each one actually lets you control (instrumental mode, length, stems, languages) is the subject of how to choose an AI music generator.

If music is the part you are working on, these go further: How to make a jingle with AI, AI music for podcasts, Music for Twitch streams, AI music for streamers, and Background music for videos.

Frequently Asked Questions

Can AI make a beat without vocals?

Yes. Set the instrumental option so the generator produces no vocals, rather than relying on "no vocals" in the brief. PrismPoster's Music Studio has the toggle and returns stems with the track.

What BPM should a beat be?

It depends on the genre: lo-fi 70 to 90, boom-bap 85 to 95, trap 130 to 160 (felt as half-time), house 120 to 128, drum and bass 170 to 176. Write the number in the brief and confirm the result with a BPM tapper.

How do I loop an AI beat?

Cut on a downbeat at the start of a bar and again the same beat four, eight or sixteen bars later; a loop cut on the "one" joins without a click. Read the real tempo first so the grid lines up.

Can I rap over an AI-generated beat and publish it?

Generated music is published under the generator's licence terms; PrismPoster's are explained in the AI music licensing guide. Keep the stems and the generation record with the release.