Fascination Organ Improvisation - Imitation technique - with Franz Josef Stoiber

This video introduces in the imitation technique: real and tonal answer. normally the answer is to be a fifth above ("real"). In order to achieve smooth links and to stay within the tonal framework, one has to apply small ("tonal") changes to the second entry of the theme/subject (answer, "comes"): a fifth at the beginning of a theme is to be imitated with a fourth if the theme/subject modulates (mostly to the upper fifth key), the answer must modulate back to the tonic!