Lyrics written to fit your beat, then sung on it
Upload your beat, say in a line what the song is about, and Lyro writes lyrics sized to that beat. It plans the words from the beat’s length and tempo: about a line a bar when rapped, a line every two bars at most tempos when sung, with the first and last few bars left to the beat. Then Lyro’s vocal model sings or raps them on your beat and returns the vocal on its own track. Already wrote some lines? Lyro keeps them word for word and fills the rest.
Plans from $14 a month, enough for about 11 vocals on 1-minute beats. No free trial. Cancel in two clicks.
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How it goesThree steps
- Upload your beat and check the tempoLyro reads its length, tempo and key in your browser. The tempo decides how many lines fit, so if a 140 BPM trap beat shows 70, type the real number before the words are written.
- Say what it is about, then writeWrite a line about the subject, choose a sung or rap voice, and press Write lyrics. Lyro plans the sections and line counts for this beat, writes them, and shows how many seconds of the beat they fill.
- Generate the vocal, then mixLyro’s vocal model sings or raps the words on your beat, usually in two to three minutes, and returns the vocal on its own track. It opens in the studio beside your beat, ready to balance and master.
The details
How the words are sized to your beat
Lyro’s lyric writer gets a plan for your beat before it writes a word. The plan comes from the beat’s length and tempo: up to eight bars at the start and four at the end stay instrumental, and the rest is filled with whole sections that end on a hook or a chorus. Every repeat is written out in full, because the vocal model sings exactly what it reads.
| Rapped | Sung | |
|---|---|---|
| One line lasts | One bar | About four seconds: two bars above about 110 BPM, one bar on slower beats |
| Section sizes | Verses of 16, 12 or 8 bars, hooks of 8 or 4 | Verses of 8 or 4 lines, a 2-line pre-chorus, a 4-line chorus, and a bridge when the beat is long enough |
| Syllables a line | Set by the tempo: more on slow beats, fewer on fast ones | Kept within two of each other inside a section, so the melody has room |
| A three-minute beat | At 140 BPM: Verse 1 (16 lines), Hook (4), Verse 2 (16), Hook (4), Verse 3 (16), Hook (4), Verse 4 (16), Hook (4). 80 lines, about 510 words. | At 120 BPM: Verse 1 (8 lines), Pre-Chorus (2), Chorus (4), Verse 2 (8), Pre-Chorus (2), Chorus (4). 28 lines, about 170 words. |
Already wrote some of it?
Paste what you have. The Create page shows how many seconds of the beat your words fill. When they cover less than about 60% of it, it warns that the rest will be empty or hummed and offers Fill the rest: Lyro keeps every one of your lines exactly as you wrote them, in order, at the start, then writes the remaining sections around them, on the same subject and in the same voice.
Want to change the draft? The buttons under the lyrics tighten the lines, make the hook catchier or simplify the words. Or edit the text yourself: what is in the box is what gets sung.
Why the length matters
A vocal model sings the words it is given, and then the beat is still playing. On our own one-minute test beat, a verse and a chorus of eight lines came back sung, with the rest of the minute filled by “ah” and “ooh”. That is why Lyro writes for the beat you uploaded instead of handing every beat the same verse and chorus. The syllable counter checks lines you write yourself.
Where the limits are
- The words are a draft from a language model. Read them before you spend credits, and change anything that does not sound like you.
- The melody is the model’s. It writes its own tune for the words, and a new one on every take.
- The plan trusts the tempo reading. A beat read at half or double its real tempo gets half or twice the lines it needs, so check it first.
- The plan knows the beat’s length and tempo, not where its breaks are. A long instrumental break gets words too: trim those lines, or upload only the part that should carry a vocal.
- Lyrics can be written in 12 languages. Turkish lyrics are sung on a second path, over music generated at your beat’s tempo and key and then separated, so they need lining up in the studio.
- AI vocals can mispronounce words, especially names and slang. Respell a word the way it sounds and generate again.
- You need the rights to the beat you upload. If you leased it, check what your lease allows.
Credits, plans and rights
Writing and rewriting the lyrics uses writing-assistant requests, not credits: Starter includes 100 a month and Creator 400. The vocal costs 7 credits for a beat of up to a minute and 11 credits for three minutes, on every plan, Starter included ($14 a month for 80 credits). If a job fails, every credit for it comes back automatically.
Every paid plan includes a commercial licence for what Lyro generates, and downloads carry an ID3 tag declaring them AI-generated. Lines you write or rewrite yourself are human-authored work. See music rights.
Questions
Can AI write lyrics to my beat?
Yes. Upload the beat to Lyro and say what the song is about: the lyric writer plans the words from the beat’s length and tempo, then Lyro’s vocal model sings or raps them on the beat and returns the vocal on its own track. Writing uses writing-assistant requests; the vocal costs 7 credits for a beat of up to a minute, on every plan.
How many lines of lyrics does my beat need?
Rapped, about one line a bar. Sung, one line every two bars above about 110 BPM and one a bar on slower beats. Leave the first few bars and the last few to the beat. For a three-minute beat that comes to about 80 rapped lines at 140 BPM, or 28 sung lines at 120 BPM. Lyro does this sum for you and shows how much of the beat your words fill.
Will Lyro keep the lines I already wrote?
Yes. Fill the rest keeps every one of your lines exactly as written, in order, and writes the remaining sections around them. Lyro offers it when your words cover too little of the beat.
Can it rap the lyrics instead of singing them?
Yes. Choose Rap, or Rap, female, before you write: the plan switches to a line a bar, with verses of up to 16 bars, and the vocal model raps them on your beat. See AI rap vocals on your beat.
Will the vocal follow a melody I have in mind?
Not note by note. You steer it with the words, the voice and a line of style, and the model writes the melody. If you need an exact tune, record a rough guide yourself and bring it into the studio.
What does it cost?
Writing the lyrics uses writing-assistant requests (100 a month on Starter), not credits. The vocal costs 7 credits for a beat of up to a minute and 11 credits for three minutes, on every plan: Starter is $14 a month for 80 credits. See the pricing page.
Related: Add vocals to a beat, AI rap vocals on your beat, A sung hook for your beat, AI lyrics generator, Fix AI vocals that are off beat
Guides: How to add AI vocals to your beat, Can Suno add vocals to your own beat? What Add Vocals does