Music-Theoretic Estimation of Chords and Keys from Audio

This paper proposes a new method for local key and chord estimation from audio signals. This method relies primarily on principles from music theory, and does not require any training on a corpus of labelled audio files. A harmonic content of the musical piece is first extracted by computing a set of chroma vectors. A set of chord/key pairs is selected for every frame by correlation with fixed chord and key templates. An acyclic harmonic graph is constructed with these pairs as vertices, using a musical distance to weigh its edges. Finally, the sequences of chords and keys are obtained by finding the best path in the graph using dynamic programming. The proposed method allows a mutual chord and key estimation. It is evaluated on a corpus composed of Beatles songs for both the local key estimation and chord recognition tasks, as well as a larger corpus composed of songs taken from the Billboard dataset.

Nueva ara dedicada a “Mater Dea” procedente de “Veleia” (Iruña de Oca, Álava)

[ES] La realización de algunos trabajos de adecuación del paisaje en la zona sur de la ciudad, en la zona extramuros del llamado "oppidum", han dado como resultado hace pocas semanas la identificación de algunas estructuras de época romana y, sobre todo, de un ara dedicada a la diosa "Mater" cuyo texto conservado abre muchas posibilidades de análisis futuro sobre este asentamiento.