TerryTrilla

Harmonize Melody: Chords, Key

Only for iPhone

Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.

iPhone

TerryTrilla turns any melody into full harmony — instantly. Load a song or write your own melody on the Circle-Keyboard, and TerryTrilla shows you exactly what to play, bar by bar. It is a chord finder, song key finder, melody harmonizer, chord progression generator, bass line generator and solo guide — all in one, built for songwriters, students, guitarists, pianists, singers and producers. KNOW WHAT TO PLAY — BAR BY BAR - Chords for every bar, with their function (Tonic, Subdominant, Dominant) and scale degree — so you finally understand WHY each chord works - Song key and scale detection across the whole piece - Bass lines that follow the harmony, note by note - Demo solo ideas over each chord, with the scale they come from - Guitar chord shapes mapped on the fretboard, with several ways to grip each chord - Piano chords on the keyboard, in the same view FIND CHORDS FOR ANY SONG Stop hunting through tabs. Load a song and get its chords, key and structure in seconds. See what chords are in the song, how they connect, and how to play them on guitar or piano. FIND THE KEY OF ANY SONG Song key finder and scale detector. Know the key, the mode and the notes you can use — before you jam, practise or write a solo. CREATE — DO NOT JUST COPY Give TerryTrilla a melody and it writes the harmony: - Harmonize melody into a complete chord progression - Reharmonize any section across five worlds — Classical, Jazz, Cinematic, Pop and Neo-Soul - Generate chord progressions bar by bar and hear them straight away - Choose the key and scale family your piece lives in, and keep your notes locked to it while you write - Add lyrics under the melody, syllable by syllable - Play along at your own tempo, with tap tempo and a count-in BRING YOUR OWN MUSIC IN Upload your score and get chords instantly — no blurry photos, no guessing: - Open MusicXML / .mxl files and get chords, key and bass - Export from your notation app as MusicXML and open it here Real notes in, real harmony out. PLAY IN TUNE, PLAY IN TIME - Chromatic tuner with modes for guitar, bass, ukulele, violin, viola, cello, trumpet, saxophone and flute - Alternate guitar tunings: drop D, drop C, DADGAD, open G, open D, half step down, 7- and 8-string - Metronome with time signatures, accents and subdivisions — beats, 8ths, triplets, 16ths LEARN THE LANGUAGE OF MUSIC - See functional harmony and roman-numeral degrees in action - Think in degrees and function, not just chord letters - Follow the score bar by bar while it plays — notation and harmony together - A practical companion for music theory at every grade HOW IT WORKS 1. Load a song file or tap a melody on the Circle-Keyboard 2. TerryTrilla analyses the key, harmony and every bar 3. See chords, bass, solo and guitar shapes — then reharmonize and play along WHO IT IS FOR - Songwriters looking for chords that fit their melody - Guitarists and pianists learning chords, scales and the fretboard - Producers building progressions and bass lines fast - Students and teachers of harmony, music theory and ear training - Anyone who plays by ear and wants to know what is really going on Plus and Pro plans unlock deeper harmony, solo, guitar shapes and reharmonization worlds. SUBSCRIPTIONS Plus and Pro are auto-renewable subscriptions, offered monthly or yearly. Payment is charged to your Apple ID at confirmation of purchase. A subscription renews automatically unless it is cancelled at least 24 hours before the end of the current period. Manage or cancel your subscription in your App Store account settings at any time. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://terrytrilla.com/privacy-policy Whatever song is in your head, TerryTrilla shows you the music behind it — and helps you make it your own.

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Fixed: sign in with Google. Tapping "Continue with Google" could close the app instead of opening the Google sign-in screen. It now works as expected. Also in this update: layout fixes on the larger iPhone screens and smoother animations in the practice circle.

Version 1.0.8

The developer, TerryTrilla LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Linked to You

    The following data may be collected and linked to your identity:

    • Purchases
    • Contact Info
    • User Content
    • Identifiers
    • Usage Data
    • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More

Accessibility

The developer has not yet indicated which accessibility features this app supports. Learn More

Information

Seller
  • TerryTrilla LLC
Size
  • 44.1 MB
Category
  • Music
Compatibility
Requires iOS 15.0 or later.
  • iPhone
    Requires iOS 15.0 or later.
  • iPod touch
    Requires iOS 15.0 or later.
  • Mac
    Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
  • Apple Vision
    Requires visionOS 1.0 or later.
Languages
  • English
Age Rating
4+
In-App Purchases
Yes
  • Pro Credits $24.99
  • Standard Credits $9.99
  • Starter Credits $4.99
  • Pro $219.99
  • Pro $24.99
  • Plus $143.99
  • Plus $14.99
  • Learn More
Copyright
  • © 2026 TerryTrilla LLC
  • Developer Website
  • Privacy Policy