Tool / Vocal harmony generator: turn a melody into a usable sketch
Interactive arranging workflow

Vocal harmony generator: turn a melody into a usable sketch

Automatic thirds and sixths are useful for hearing an idea quickly, but a convincing vocal arrangement depends on chord tones, range, voice leading, lyrics and contrast with the lead. Use the generator as a draft, then edit musically.

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Editorial responsibility: Leon, recording engineer and music producer at Flash Records · Reviewed 14 July 2026

Record a clean melody fragment

Choose the key, press REC and play two to four bars with a clear rhythm. A compact phrase is easier to evaluate than a whole song and makes wrong notes obvious.

Compare four directions

  • UP 3: a diatonic third above, often bright.
  • DOWN 3: a warmer third below that may become muddy.
  • UP 6: an inverted-register alternative to a third below.
  • DOWN 6: greater separation but a possible low-range problem.

Listen together and alone

Keep +MEL on to judge blend. Then turn the melody off and hear the generated line alone. Check whether it has singable steps, manageable leaps and a logical destination.

Correct the line against the chord

If the lead sings E over C, G above it is stable. F can work as a suspension but usually needs to resolve. On every sustained syllable, identify the chord and decide whether the harmony note is a chord tone, intended tension or mistake.

Arrange entrances and exits

Backing vocals do not need to copy every lead note. They can enter at line endings, hold a common tone, answer the lead or expand into three parts only for the final chorus. Selective harmony sounds more intentional than continuous parallel motion.

Prepare for recording

  1. Fit the sketch to the singer’s range.
  2. Write down final notes.
  3. Mark breaths and consonants.
  4. Record one line at a time.
  5. Check tuning in context.
  6. Process only after the musical line works.

Questions and answers

Why can an automatic note sound wrong?

The selected scale may not match a borrowed or altered chord.

Is a sixth different from a third?

It can be an inversion in another register, changing colour and singability.

Must harmony copy every rhythm?

No. Holds and answer phrases often work better.

Can I use the sketch commercially?

You remain responsible for the final arrangement and rights in the underlying song.