Musical Diary: An imitation game, by Prisca Stalmarski
Prisca Stalmarski (violin) experiments with Renaissance counterpoint in a canon of her own, using the Gregorian plainchant "Ave maris stella" (shown) as a cantus firmus. For each phrase of plainchant, she composed a line of counterpoint which works in perfect canon with itself at either the fourth, the fifth, or the octave away from the original voice.
The full details of her compositional process, including some background about cantus firmus and counterpoint can be found here (German): http://titansrising.de/ein-imitation-...