Pattern in music, referring to the discovery, representation, selection, and interpretation of repeated structures within single pieces (intra-opus) or corpora (inter-opus), is a central part of music analysis, musical style and genre, improvisation, music perception, and composition. This special issue of the Journal of Mathematics and Music presents a diverse selection of papers on the topic of pattern in music from computational and mathematical perspectives. The following overview will introduce the papers considering three facets: representation, discovery, and evaluation and interpretation.