Beat and vocals generated together, not a beat you rap over later. Bring your own bars or let Forge write them, then keep the sound as a reusable persona.
Most bad AI rap comes from a prompt that asks for a subgenre at the wrong tempo. Each of these has a narrow pocket, and stepping outside it produces something that sounds almost right and rhythmically wrong.
| Subgenre | Tempo | Drums | Bass | Feel |
|---|---|---|---|---|
| Trap | 130-150 | Rapid hi-hat rolls, sparse kick | Gliding 808 sub | Halftime bounce |
| Drill | 138-145 | Skippy, off-grid pattern | Sliding 808 with pitch bends | Menacing, unsettled |
| Boom bap | 85-96 | Cracking swung kit, dusty | Round upright or sampled | Head-nod pocket |
| Phonk | 130-150 | Memphis cowbell, distorted kit | Overdriven 808 | Hazy and aggressive |
| Cloud rap | 120-140 | Soft trap kit, heavy reverb | Warm sustained sub | Floaty, ambient |
This trips up more people than anything else. Trap, drill and phonk are written at double-time tempos but felt at half that. The hi-hats subdivide fast enough to fill a 145 BPM grid while the snare lands once per bar instead of twice, so your ear hears a slow, heavy beat.
If you ask for 70 BPM trap you will get something that drags, because the generator takes the number literally and halves the subdivision too. Ask for 145 BPM, halftime bounce instead. The word halftime is what tells it where the snare goes.
Boom bap is the opposite case. It is genuinely slow, 85 to 96, and the swing lives in the drums rather than the subdivision. Asking for boom bap at 140 gives you a frantic loop that no one can rap over.
Order matters more than length. The generator weights the front of the prompt most heavily, so lead with the things you refuse to compromise on. A reliable shape:
Every vibe button at the top of this page follows exactly that order. Open one and read it as a template rather than a preset.
Section tags are not decoration. They tell the model where the beat changes and where the vocal should sit back. Use them on their own line:
[Intro] [Hook] [Verse 1] [Hook] [Verse 2] [Hook] [Outro] is the workhorse rap structure.Never coming back (never, never) works; a stage direction like (aggressively) does not.On density: at 145 BPM halftime you have room for twelve to sixteen syllables per bar before it stops being singable. At 92 BPM boom bap, ten to fourteen. The Studio's pre-flight check counts this for you as you type.
Write the prompt at 130 to 150 BPM and add the phrase halftime bounce. Trap is written at double time but felt at half, so a 145 BPM prompt produces a beat that feels like roughly 72. Asking directly for 70 BPM trap produces a beat that drags.
Yes. Paste them into the lyrics field with section tags like [Verse 1] and [Hook] on their own lines. Parenthetical ad-libs are performed as backing vocals. You can also write a first draft with AI and then edit it before generating.
Yes. The output is a finished song with rapped vocals over its own production, mixed and mastered, rather than an instrumental you record over separately.
Signup gives 60 credits and a full song costs 25, so two complete songs plus enough left over for prompt generation and a lyric rewrite. No card is required.
You own what you make on PickaxeSound and can release it. Streaming platforms and distributors each have their own AI disclosure policies, so check the rules of whichever service you are uploading to before you distribute.