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Melody is an important property for the perceptual description of Western musical pieces. In the monophonic context, retrieval systems based on melodic similarity generally consider sequences of pitches and durations. Algorithms that have been proposed for measuring melodic similarity rely on geometric representations, string matching techniques, etc. Adaptations of editing algorithms, mainly applied in bioinformatic applications, to the musical domain have already been proposed. However, we present in this paper several experiments in order to optimize these methods. The different possible representations for pitches and durations are discussed and evaluated. Optimizations specific to musical applications are proposed and imply significant improvements of the editing algorithm studied. Evaluation of this algorithm led to the best results during the MIREX 2006 symbolic melodic similarity contest. 2 Problem Formalization Algorithms for retrieval systems based on melodic similarity consist of two main steps. The first one transforms a symbolic monophonic musical piece into a symbolic sequence. The second one computes a similarity score between two representations. These two steps are presented in this section.

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