In this paper we describe a musical harmonisation and composition assistant based on Answer Set Programming (ASP). The tool takes scores in MusicXML format and annotates them with a preferred harmonisation. If specified, it is also able to complete intentionally blank sections and create new parts of the score that fit with the proposed harmonisation. Both the harmonisation and the completion of blank parts can be seen as constraint satisfaction problems that are encoded in ASP. Although the tool is a preliminary prototype still being improved, its basic functionality already helps to illustrate the appropriateness of ASP for musical knowledge representation, which provides a high degree of flexibility thanks to its relational, declarative orientation and an efficient computation of preferred solutions.
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