Ensemble SCALA is the new ensemble for microtonal music, initiated in 2009 by the Huygens-Fokker Foundation, which manages the unique Fokker organ, to explore microtonality across a spectrum of timbres. The 31-tone Fokker organ is used here as part of a larger acoustic ensemble. For the third consecutive year, Ensemble SCALA will perform in the Kleine Zaal of the Muziekgebouw a programme consisting solely of music with unconventional tunings and alternative divisions of the octave. The programme includes a composition by the former Fokker organist Anton de Beer. In celebration of the 450th anniversary of Sweelinck’s birth, two works in meantone tuning will also be performed. The concert 31 Steps to Heaven concludes with the eponymous work by composer René Samson, a lightly microtonal piece in which 12-tone and 31-tone lines are combined and set in interplay with one another.