Proceedings of the Twenty-Fourth International Joint Conference on Artificial Intelligence (IJCAI 2015) Computational Invention of Cadences and Chord Progressions by Conceptual Chord-Blending Manfred Eppe16, Roberto Confalonieri1, Ewen Maclean2, Maximos Kaliakatsos3, Emilios Cambouropoulos3, Marco Schorlemmer1, Mihai Codescu4, Kai-Uwe Kuhnberger¨ 5 1IIIA-CSIC, Barcelona, Spain 2University of Edinburgh, UK 3University of Thessaloniki, Greece fmeppe,confalonieri,
[email protected] [email protected] femilios,
[email protected] 4University of Magdeburg, Germany 5 University of Osnabruck,¨ Germany 6 ICSI, Berkeley, USA
[email protected] [email protected] [email protected] Abstract chord and moves to the tonic, and the seventh resolves down- wards by stepwise motion, whereas the fifth may be omitted. We present a computational framework for chord inven- In the Phrygian cadence, the bass note (third of the chord) is tion based on a cognitive-theoretic perspective on con- ceptual blending. The framework builds on algebraic the most important note as it plays the role of a downward specifications, and solves two musicological problems. leading note, and the second most important note is the root. It automatically finds transitions between chord progres- In such a setup, we propose two applications of chord blend- sions of different keys or idioms, and it substitutes chords ing, to give rise to new cadences and chord progressions. in a chord progression by other chords of a similar func- The first application is to generate a novel cadence as a ‘fu- tion, as a means to create novel variations. The approach sion’ of existing cadences by blending chords with a similar is demonstrated with several examples where jazz ca- function.