Rok, in Classical music a “Fantasy” (usually seen as “Fantaisie” in French or ”Fantasie” in German) is a musical work written in the style of, or meant to convey the feeling of, an improvisation. One of the key ways that a composer tries to achieve this is by not adhering to traditional “forms”. The composition then doesn’t follow many of the traditional compositional “rules” and so it conveys a sense of freedom. However, there is no actual improvisation and it is entirely pre-composed. As with all Classical works there is still much room for personal interpretation and expression in the performance.
In Jazz there is, as we all know, spontaneous improvisation (spontaneous composition). However, unless we are talking about “free jazz”, the improvisation follows the “rules” of the specific form and harmonic chord progression of the tune. One of the most important aspects of the concept of “evolution” in jazz has been that the more modern the jazz the more those rules were broken or certainly stretched; particularly in the realm of harmony or the way (note choices) that players improvise over each harmonic change (chord) of a tune.
In Jazz there is, as we all know, spontaneous improvisation (spontaneous composition). However, unless we are talking about “free jazz”, the improvisation follows the “rules” of the specific form and harmonic chord progression of the tune. One of the most important aspects of the concept of “evolution” in jazz has been that the more modern the jazz the more those rules were broken or certainly stretched; particularly in the realm of harmony or the way (note choices) that players improvise over each harmonic change (chord) of a tune.