Twelve Tone
Composition and Analysis Tool
$4.99
An indispensable resource for any musician or music teacher interested in dodecaphonic and set theory analysis.
An extensive music composition and analysis tool. An indispensable resource for any musician or music teacher interested in dodecaphonic and set theory analysis.
• Enter a tone row by touching the staff or playing the piano keyboard.
• It lets you know if any notes are repeated by highlighting both notes, checking enharmonic values regardless of octave or accidentals.
• Automatically creates the Prime, Inversion, Retrograde, and Retrograde Inversion Magic Square.
• Constantly updates the Interval Vectors and Circular Analysis of the tone row as you edit it.
• Save your rows (rows may contain from 1 to 12 notes), complete with name and current P, R, I, RI matrix markings. Saved rows appear in a list with their name and midi numbers to help you identify them.
• Share a pdf of the notation, piano keyboard, and circular analysis.
• Watch and listen to your row played with a selected rhythm pattern.
• Playback:
- Prime
- Prime then Retrograde
- Retrograde then Prime
- Retrograde
- Inversion
- Inversion then Retrograde Inversion
- Retrograde Inversion then Inversion
- Retrograde Inversion
• Each can be repeated and transposed with each iteration.
• The Root is kept within an octave above and below the original pitch when looping and transposing.
• Matrix Audio: Hear the pitches as you mark them in the matrix square. The marks indicate the row form in which the pitch belonged; Prime, Inversion, Retrograde, and Retrograde Inversion.
• Lock the prime row and transpose it to C to use the Absolute Pitch Method for row labeling in the matrix.
Comes preloaded with the following rows:
Alban Berg's Lyric Suite
Babbitt's Composition for Four Instruments
Schoenberg's Variations for Orchestra Op.31
Schoenberg's Piano Piece Op.33a
Webern's Concerto Op.24
Webern's Piano Variations Op.27
Webern's String Quartet Op.28
Added Piano to iPhone. Updated User Interface. Minor updates and stability improvements.
The developer, Patrick Q. Kelly, 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 Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Patrick Kelly
- Size
- 52.7 MB
- Category
- Music
- Compatibility
Requires iOS 26.0 or later.
- iPhone
Requires iOS 26.0 or later. - iPad
Requires iPadOS 26.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- ©2010-2026 Patrick Q. Kelly. All Rights Reserved.

