Our research goals are to develop algorithms for retrieval and analysis of folk music. The work is based on the Slovenian archive of folk music and dance culture Ethnomuse, which gathers a large variety of multimedia materials, including audio, scores, videos, lyrics and textual metadata (including GIS locations). Music includes solo and choir singing, instrumental music, as well as change ringing. The goals of our research group are to develop tools and methods that will be used by folk music researchers (such as transcription and search-by-melody in symbolic and audio domains), as well as to develop algorithms for data mining and visualisation of the archives contents. Folk music is passed on orally, so songs change over the time, mix with other songs etc. Complex relations exist between song variants in the archive, which encourages us to research methods of discovering and visualising these relations.