Can an AI melody generator give you a tune that fits lyrics you already have?

You have a chorus. It is finished, you like it, and the first line reads like this:

I'm not coming back to the house on Linden Street        12 syllables

You open a melody generator, pick a key and a mood, and it hands you eight bars of MIDI. The hook it wrote for the first line looks like this:

E4  E4  G4  A4  G4  E4  D4  C4                           8 notes

Eight notes, twelve syllables. Four of your words have nowhere to sit. And there is a deeper problem hiding behind the arithmetic: the tool never saw your chorus. You did not paste it anywhere. It wrote a perfectly reasonable melody for a song it knows nothing about, and now the fitting is your job.

That is the honest answer to the question in the title. Yes, you can get a tune for lyrics you already have, but most tools sold as "AI melody generators" do not read lyrics at all. The ones that do either give you notes to edit or give you a finished vocal you cannot edit note by note. Which kind you want depends on what you plan to do next, and picking wrong costs you an evening.

If your real question is the craft one, whether a song should start from the words or from the tune, read Do the words come first or the melody? first. That page is for the writer still deciding how to work. This one is for the writer whose words are done and who wants a tool to put a tune under them.

One disclosure. sunomarket is an independent site. We are not Suno, Hooktheory, Dreamtonics or the makers of MelodyStudio, and we are not affiliated with any of them. Our own lyrics generator writes words, not melodies, and it comes up later only where it honestly fits.

Three different tools share one search term

Type "melody generator" into a search bar and you get three families of product mixed together. They answer different questions.

Note generators that ignore words. You give them chords, a key or a style. They give you notes, usually as MIDI. Hookpad's Aria assistant is a clear example: according to Hooktheory's own page, Aria "can write chords, melody, or both at the same time", including a melody over chords you already wrote. Nothing on that page says it reads lyrics. It works from music, not from text.

Lyric-aware melody tools. You paste the words and the tool proposes a top line for them, then lets you edit the notes. MelodyStudio describes itself this way on its own site: it analyses your lyrics, suggests melodies that fit them, puts the result on a timeline of MIDI notes you can drag, and exports MIDI for a DAW. We have not tested it, so treat that as the maker's description, not a review.

Song generators that sing your lyric. You paste the words with section tags, describe a style, and get back a finished recording with a voice on it. Suno works this way in Custom mode, where the help centre says you can enter your own lyrics. The melody comes for free, because something has to sing the words. What you do not get, in a normal generation, is a piano roll for that vocal line.

The fourth row is not a melody generator. It is on the table because people searching for one often land on it, and because it is where a melody from row one or two usually ends up.

The arithmetic every route runs into

Whichever family you pick, someone has to marry syllables to notes. A note generator leaves it to you. A lyric-aware tool attempts it and hands you the result to correct. A song generator does it silently inside the model and gives you no say.

There are only two moves, and both are visible in the Linden Street line.

Move one: cut the words to fit the notes.

note      E4    E4     G4   A4    G4   E4    D4    C4
syllable  I     won't  go   back  to   Lin   den   Street

Eight syllables, eight notes. "I'm not coming back" became "I won't go back", and "the house on" went. The line lost a picture, the house, and kept the street name, which carries the place on its own. The strong syllables, "won't", "back", "Lin" and "Street", fall on every second note, so a singer gets a steady pulse to lean on.

Move two: split the notes to fit the words.

note      E4   E4    E4   E4   G4    A4   A4   G4     E4   E4    D4    C4
syllable  I'm  not   com  ing  back  to   the  house  on   Lin   den   Street

The first, second, fourth and sixth notes of the original melody were each split in two. Twelve notes now, every word kept. The cost is rhythm: the opening is four quick syllables on one pitch, which reads as a rush into the line. Sometimes that rush is the point. Often it sounds like the words arrived late.

Most real fixes are a mix: cut one throwaway word, split one note. If you want a faster way to see where a verse is lopsided before you touch any melody, How do you use a syllable counter to make lyrics fit the melody? walks through the counting side in detail. The short rule: lines that sit in the same position in each verse should land within a syllable or two of each other, or the melody that worked for verse one will not survive verse two.

Route one: you want notes you can edit

This is the route for songwriters who will finish the song in a DAW, hand a demo to a singer, or need a top line that sits exactly on a chord change.

A workable chain with tools whose features we could confirm on their makers' pages:

1. Get chords first. Aria writes melody over chords, so the chords need to exist. If you have none, Chord progression generators and the six progressions worth knowing covers where to get a progression that suits the mood of your lyric.
2. Generate the melody in Hookpad. Aria is a paid add-on at the time of writing, and Hooktheory's plan comparison shows MIDI export as a paid-tier feature, not a free one. Check the current plan page before you budget for it.
3. Fit the words yourself. Read the lyric against the generated notes, line by line, and apply the two moves above. Do this before you fall in love with any melody, because a hook that cannot carry your title line is not your hook.
4. Hear it sung. Export MIDI and bring it into a vocal synth. Dreamtonics says Synthesizer V Studio 2 Pro can import a MIDI file, take your lyrics and turn the notes into a vocal part, and its update notes describe an option that splits one note evenly into several syllables, which is move two done by the software. Our page Synthesizer V, ACE Studio or Vocaloid compares the three main vocal synths if you have not chosen one.

The lyric-aware alternative skips step three's guesswork: a tool like MelodyStudio starts from your words, so the syllable count is attempted for you. You still check every line, because no tool knows which word in your chorus is the one that must land on the high note.

What you get on this route: full control, a melody you can defend note by note, and real time spent. Expect an evening per song for the first few, less once the habit forms.

Route two: you want to hear it sung today

This is the route for people who want a finished-sounding song from their lyric, and who care more about hearing it than about owning each note.

In Suno's Custom mode you paste your lyric into the Lyrics field and describe the sound in the Style field. Suno's own guide to making a song recommends structure tags such as [Verse], [Chorus] and [Bridge]. The model writes the melody as it sings. You do not choose the notes; you choose the words, the tags and the style, then run it again if the tune is wrong.

Three things decide how well your existing lyric survives this route:

• Line length per section. The model has to sing whatever you paste. A verse with a twelve-syllable line next to a four-syllable one forces it to cram one and stretch the other. Even the counts out before you paste, using the two moves above.
• Tags that say where the hook is. A [Chorus] tag over the lines you want repeated tells the model which part the song is built around. Our guide on song structure in Suno covers the tags that matter.
• A Style field that does not fight the lyric. A dense, wordy lyric under a slow ballad description is a mismatch you created. Match the density of the words to the feel you ask for.

And if you later want the notes after all, there is a bridge back to route one. Suno's help centre describes a Get MIDI option in Suno Studio: extract stems, click one, choose Get MIDI, and Studio produces a MIDI file for your DAW. The same page says it costs 10 credits. Suno's pricing page lists Studio on the Premier plan only, at the time of writing. That turns a vocal you liked into editable notes, though it is a transcription of what was sung, so plan on cleaning it up. More on the tool itself in What is Suno Studio?

A rights note, since this route produces finished audio. Suno's pricing page shows the free plan without commercial rights at the time of writing, and the terms differ by plan and change over time. Read the current terms before you release anything. This is not legal advice; our disclaimer sets out what sunomarket does and does not promise.

Route three: you want a sketch, then decide

Some writers do not know yet which route they are on. For them the cheapest move is to run the lyric once through a song generator, listen to where the melody lands the title, and then decide whether that tune is the song or just evidence.

If the generated melody puts your best line on a weak beat, you have learned something about the line, not about the tool. Lines that keep landing badly across several generations usually have a counting problem from the section above, and fixing the count helps on every route.

Where sunomarket fits, and where it does not

The question in the title assumes your lyric is finished. If it is, our lyrics generator has nothing to add to your melody: it writes words, it does not compose, and it never sings. Anyone telling you a lyric tool will pick your tune is selling you something it cannot do.

There are two honest places where it helps:

• The lyric is not quite finished. You have a strong chorus and a verse that will not come. The generator takes a brief through a form, with fields for the theme, the point of view, the language, the emotion, the structure (classic, no-bridge, double-chorus, story, loop or ballad) and the kind of hook, and returns a title and a full lyric with [Verse] and [Chorus] tags already in place. Use what fits, keep your own chorus, throw away the rest.
• You are on route two and want a Suno-ready draft to compare against your own. A generated lyric is built to be pasted into Suno's Lyrics field. Running yours and a generated one side by side through the same Style field shows quickly whether the trouble is in your line lengths or somewhere else.

Costs, so there are no surprises: there is no free trial of the lyrics generator, and new accounts start at zero credits. The SM1 model costs 20 credits per lyric, which is $0.20. SM2 and SM3 cost 80 credits, $0.80, and run an extra pass that flags weak lines and rewrites them. Plans are on the pricing page. Generated lyrics are non-exclusive and can overlap between users, which matters if you plan to release the song.

The order to work in, starting tonight

1. Write the syllable count next to every line of your lyric. Fix the lopsided lines with the two moves: cut a word or plan to split a note.
2. Decide what you need at the end of the night: notes you can edit, or a song you can hear. That one choice picks your route.
3. Notes: chords first, then a melody tool, then fit the words by hand, then a vocal synth to hear it.
4. A song: tag the sections, paste the evened-out lyric into Suno's Custom mode, describe a style that matches the density of your words, and generate until the title lands where you want it.
5. Whichever route you took, sing the chorus out loud once without any tool. If you run out of breath before the last word, the count is still wrong, and no generator will fix that for you.