Outside (jazz)

In jazz improvisation, outside playing describes approaches where one plays over a scale, mode or chord that is harmonically distant from the given chord. There are several common techniques to playing outside, that include side-stepping or side-slipping, superimposition of Coltrane changes, and polytonality. The term outside is commonly used by jazz musicians playing in a post-bop idiom, but despite its frequent use in musicians’ jargon there is no set or standardized definition for it. As the term is commonly understood, outside is not a direct synonym to terms such as free improvisation, polytonality or atonality but a musical phenomenon in its own right.