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We propose ChordScanner, a visual interface enablingusers to find chord progressions that they typically use
and that many composers also typically use. ChordScanner provides a time-orientedview of chord progressions
and highlights two kinds of chord progressions: chord
progression the user frequently used and chord progression typical of many composers. To develop this system,
we proposed a method for calculating intra-composer
consistency based on the user’s pieces and musical typicality based on many composer’s past pieces by using aprobabilistic model. The system helps users notice theirrepeatedly used chords. It also presents chord progression rankings based on the consistency and typicality. We
investigated the overlap between rankings obtained withboth consistency and typically, by calculating Japanese
consumer generated songs, and also interviewed a professional composer.

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SURIHVVLRQDO FRPSRVHU ZKR KDG H[SHULHQFH ZLWK SLHFHVRUGHUHGE\PXVLFDOSURGXFHUV‘They have some images ofthe pieces they want, not only specific images like existing pieces but also broad outlines based on typicality, butthey tend to describe them in vague terms. So sometimes
it is hard for me to understand their wishes correctly.’ 
7KLV LV D SUREOHP WKDW RFFXUV QRW RQO\ ZLWK PXVLF SURCopyright: © 2018 Hiromi Nakamura et al. This is an open-access article
dis- tributed under the terms of the Creative Commons Attribution License 3.0 Unported, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source arecredited.

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3.2.1 Chord sequences visualization by horizontal bars
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① Probabilistic model of each song
Piece 2

Piece 1probabilistic modelof piece 1

Piece N

Piece 3model of piece 2

model of piece 3

model of piece N③ Calculation of consistency and typicality
probabilistic modelof song set

Song setby users(composed by user)
Song setby several composers

probabilistic modelof song set(composed byseveral composers)② Probabilistic model of song set

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3.2.3 Generative probability ranking chart of users’/many composers’ pieces
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composers’ with the ranking of many composers’:HJRWDPXVLFDONH\VHTXHQFHRIWKHVHVRQJVE\WUDQVSRVLQJWKHPWR&PDMRUEHFDXVHWKHFKRLFHRIFKRUGVGHSHQGV RQ WKH PXVLFDO NH\ 7KH PRGHO SDUDPHWHUV RI WKH
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4.2.1 Result: Comparing generative probability ranking
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WKUDQNHGFKRUGVHTXHQFHUHJDUGLQJW\SLFDOLW\4.2.2 Feedbacks about chord progression ranking and UI:HLQWHUYLHZHGZLWKDSURIHVVLRQDOFRPSRVHU7KHLQWHUYLHZHH FRXOG WHOO FRUUHFWO\ IURP WKH UDQNLQJ ZKLFK GD
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PHQWVIURPWKHLQWHUYLHZHH “Regarding the composer 1,
there are frequently used tension chords and there exist
chord progressions which represent somewhat a character or a style of the composer 1, which made it easier forme to tell which one is by the composer. On the other
hand, the other composer (composer 2) does not havethat kind of chords (add9), which also gave me a clue.”
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WXUHLQRXUV\VWHPE\XVLQJWKHP)XUWKHUPRUH WKH LQWHUYLHZHH FRPPHQWHG DV “It is interesting to see which chord is repeatedly used in a song,and that is useful to me. I would like to know, if possible,
the rare chord progressions; such as chord progressions
which are only frequently used by a particular composer
or a chord sequence which nobody has ever used.”
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