Sideviisi

Sideviisi is a term that has appeared in Finnish-language discussions to refer to a concept in music theory or rhythm, but there is no widely accepted definition. The term is informal and not part of standard curricula or dictionaries. Etymology is uncertain; some commentators speculate it fuses the Finnish word viisi, meaning five, with a word meaning side or aside, hinting at a relationship to a side-phrase or five-beat subdivision. However, no consensus exists about its origin or precise meaning.

In reported usages, sideviisi has been described as either a rhythmic pattern that emphasizes a five-beat subdivision within a measure, or as a melodic device in which a secondary or side phrase accompanies the main melody. Others treat it as a speculative concept used in discussions of experimental or improvised music, without formal definition.

Documentation is sparse. The term has appeared primarily in informal online discussions, small publications, and niche forums in Finnish; it does not appear in major music-theory reference works. As such, interpretations vary and new definitions may emerge if the term gains wider acceptance.

See also: B-side, motif, rhythm subdivision, Finnish music terminology.