Add AI Vocals to Instrumental Tracks

Upload an instrumental track, write the lyrics you want sung, and describe the vocal style, and the AI performs those words over your music — matching the timing, rhythm, key, and mood of what you uploaded rather than singing on top of it out of time. Because the model reads your instrumental for its tempo and feel, the vocal is placed to sit inside the arrangement, so a beat you made or an instrumental you generated becomes a full song with a topline. It is the mirror image of Add Instrumental, which builds a band under a vocal you already have.

Two things are required: the instrumental audio file you upload, and the lyrics you want sung. The lyrics box arrives with an example in it that you overwrite, and if you clear it the job is refused rather than sent with blank words — nothing is invented behind your back on a track you paid for. Four more controls sit in the studio's Advanced panel and are optional, each pre-filled so a run works untouched — a style description for how the vocal should sound, negative tags for what to avoid, a title, and the vocal gender. Add Vocals takes an audio upload: you are providing the instrumental the singer performs over, not selecting a library track. The cleaner and more in-time that instrumental is, the better the read the AI gets on your groove and key.

Add Vocals runs only on the newest engines — v4.5+, v5 and v5.5 — because performing a convincing vocal over an external instrumental is one of the harder things the models do. Older generations can write songs from scratch well, but they are less reliable at reading an uploaded backing track and delivering a topline that stays in key and in time across the whole arrangement. Restricting this feature to the premium engines is what buys you the natural breathing, phrasing, and emotional delivery, rather than a flat or robotic read that drifts off the beat.

Negative tags tell the AI what to keep out of the performance, and the endpoint behind Add Vocals will not accept a blank one — so a value is always sent with your job. You do not have to type it: the studio pre-fills the box, and a safe default is substituted if you clear it, so a run never fails for an empty field. It is still the field most worth a moment of your time, because a vocal has many more ways to go wrong than a backing track does. Practical negative tags include "off-key, robotic, monotone, autotuned, shouty" to steer toward a natural, musical delivery. Your positive style description sets the target and the negative tags fence off the failure modes, which is often the difference between a take that feels human and one that feels synthetic.

Yes. The vocal gender control sits on Auto, where the model picks whatever suits the track; set it to Male or Female and the request asks for that voice, with the range and timbre adjusted to match — a lower, warmer delivery or a brighter, higher one. Pair the gender choice with your style description for finer control: "female, breathy, intimate" reads very differently from "female, belted, powerful". If the first result sits in an awkward range for your instrumental, switching the gender or adjusting the style description usually moves the vocal into a pocket that suits the track.

Write the lyrics as you would sing them — line breaks matter, because they hint at phrasing, and shorter, singable lines usually deliver better than dense paragraphs. For the style, be concrete about the voice and the emotion: "male, soulful, restrained verses, big open chorus" gives the model a clearer target than "good singing". If a section feels rushed or crammed, trim words from that line; if it feels empty, add a short phrase. Treat the lyrics and style as things you refine between runs rather than getting perfect on the first attempt.

You can upload the instrumental in MP3, WAV, OGG, M4A, FLAC, or AAC. The file can be up to 200MB and up to 8 minutes long. For the cleanest result, upload a clear, well-mixed instrumental that is in time — the AI derives the tempo and key from what it hears, so a loose, distorted, or very quiet backing makes the vocal harder to lock in. If your instrumental already has a scratch vocal or bleed on it, a cleaner instrumental-only version will give the AI a more reliable read.

They solve different problems. Generate Music writes the whole song — instrumental and vocal — from a text prompt, so you do not control the exact backing. Add Vocals starts from the instrumental you upload and writes only the topline over it, which is what you want when you have already made or generated a beat you like and just need it sung. Use this table to pick: Aspect · Add Vocals · Generate Music. You provide · An instrumental you upload · A text prompt only. AI generates · Only the vocal, over your track · The whole song, backing and vocal. Engines · v4.5+, v5 and v5.5 only · All versions. Cost · 20 credits · 20 credits.

Add Vocals runs asynchronously, so it is not returned instantly — you start the job, it processes in the background, and the finished vocal track appears in your Music Factory library when it is ready, typically within about a minute depending on load. You do not need to keep the tab open; the result is saved so you can come back to preview and download it. That background model also means you can queue a vocal, adjust the lyrics for a second version, and compare the two rather than waiting on a spinner.

The vocalled track becomes a normal Music Factory track you can keep shaping. If one line of the vocal came out wrong, rewrite just that span with Replace Section instead of redoing the whole thing; if the song ends too soon for your edit, continue it with Extend Track; and if you want synced words for a lyric or karaoke video, run it through Timestamped Lyrics. Because everything stays in your library, the key and tempo stay consistent from the instrumental you uploaded through to the finished, sung master.

Yes. Every output from Imagera Music Factory, including an instrumental you have topped with an AI vocal, carries a full commercial license, so you can use the finished song in videos, ads, podcasts, games, or paid client work and publish it on any platform. Credits are consumed at the moment you start the job. Bear in mind the license covers the material generated by the tool — if the instrumental you upload contains someone else's copyrighted recording, adding vocals to it does not grant you rights to that original.

The clearest use is turning a beat or instrumental you already have into a complete song. Producers use it to hear a topline over a track before committing to a session singer; content creators use it to put custom, on-brand lyrics over a music bed; and songwriters use it to test whether a set of lyrics scans and sings well before recording them for real. It is also a fast way to make a demo vocal for pitching, or to add a hook to an instrumental that felt unfinished. Because you supply the words, it is well suited to bespoke content — a jingle with your product name in it, a birthday song, or a themed track — where a generic generated vocal would not say what you need.

The AI locks the vocal to the tempo and key it reads from your instrumental, so timing problems almost always trace back to the upload. A loose, drifting, or heavily processed instrumental gives the model an ambiguous read, and a busy mix with a scratch vocal already on it can confuse where the beat sits. The fixes are practical: upload a cleaner, instrumental-only version that is steady in tempo; make sure the file is not clipped or very quiet; and keep your lyric lines singable rather than crammed, since dense lines force the AI to rush syllables. If one line still feels rushed after that, trimming a couple of words from that line usually settles it.

Add Vocals performs the voice you describe for a single job, so the delivery is driven by your style description and vocal-gender choice each time. If you want a consistent, recognisable voice across multiple tracks, the suite has a dedicated path for that: generate or vocal a track you like, then build a reusable voice persona from it so future generations can carry the same vocal identity. For a one-off song, a detailed style description — the same gender, tone, and character words each time — will already keep the voice broadly consistent, and pairing that with a persona is what makes it repeatable across a whole release.

It depends on how much control you want over the backing. If you already have an instrumental you like — one you produced, or one you generated as an instrumental in Generate Music — Add Vocals is the right tool, because it starts from that exact backing and writes only a topline over it. If you do not care about the specific instrumental and just want a finished song, generating with vocals from a text prompt is faster, since one run produces the backing and the vocal together. A common hybrid workflow is to generate an instrumental first so you can shape the beat exactly how you want it, then bring it here to add the sung part, which gives you tight control over both halves of the song rather than accepting whatever the model pairs them as.