MELODY EXTRACTION BY CONTOUR CLASSIFICATION

Due to the scarcity of labeled data, most melody extrac-tion algorithms do not rely on fully data-driven processing blocks but rather on careful engineering. For example, the Melodia melody extraction algorithm employs a pitch con-tour selection stage that relies on a number of heuristics for selecting the melodic output. In this paper we explore the use of a discriminative model to perform purely data-driven melodic contour selection. Specifically, a discrim-inative binary classifier is trained to distinguish melodic from non-melodic contours. This classifier is then used to predict likelihoods for a track’s extracted contours, and these scores are decoded to generate a single melody out-put. The results are compared with the Melodia algorithm and with a generative model used in a previous study. We show that the discriminative model outperforms the gen-erative model in terms of contour classification accuracy, and the melody output from our proposed system performs comparatively to Melodia. The results are complemented with error analysis and avenues for future improvements. 1