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.

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Euskal musika-tresnen ikas-irakaskuntza prozesuak ikertzen

[eus] Lan honen xedea euskal musika-tresnen irakaskuntzan, batez ere musika eskoletan lantzen diren metodoak aztertzea izan da, gero eremu formalera eramateko. Horretarako, Bizkaian euskal musika-tresna herrikoien egoera zein den ezagutu eta aztertzen da. Ikerketa honen oinarria, egindako elkarrizketa kualitatiboak izan dira. Bertan, metodo etnografikoa eta autoetnografikoa erabiliak izan dira. Emaitzei erreparatuz, hezkuntza formalean euskal musika-instrumentuen presentzia nahiko eskasa da. Nahiz eta irakasleen formakuntzan ere gabeziak egon, musika eskolei esker, euskal musika-instrumentuak jotzen ikasteko eta musika herrikoiaz gozatzeko aukera zabala dago.