- Second disc on Challenge by the duo Scholtes-Janssens- They present one of the milestones of the European minimalism: Canto Ostinato by Simeon ten Holt - Canto Ostinato was premiered in 1979. It is a piece that creates has several themes and implications: a different form of concert; a social process arising from the freedom that the players have to decide on the number of repetitions; the question of and time and space.