REPORT paiement:rr08-50/IDIAP Probabilistic Models for Melodic Prediction Paiement, Jean-François Bengio, Samy Eck, Douglas EXTERNAL http://publications.idiap.ch/attachments/reports/2008/paiement-idiap-rr-08-50.pdf PUBLIC Idiap-RR-50-2008 2008 IDIAP Submitted for publication Chord progressions are the building blocks from which tonal music is constructed. The choice of a particular representation for chords has a strong impact on statistical modeling of the dependence between chord symbols and the actual sequences of notes in polyphonic music. Melodic prediction is used in this paper as a benchmark task to evaluate the quality of four chord representations using two probabilistic model architectures derived from Input/Output Hidden Markov Models (IOHMMs).