yg ens - F ok ker ▁Foundation ▁() ▁is ▁a ▁" cent re ▁for ▁micro ton al ▁music " ▁founded ▁on ▁February ▁ 1 5 , ▁ 1 9 6 0 , ▁hous ed ▁in ▁the ▁M uz iek geb ouw ▁aan ▁' t ▁I J ▁( Am sterdam , ▁Netherlands ), ▁and ▁named ▁for ▁Christ ia an ▁Hu yg ens ▁and ▁Ad ria an ▁F ok ker ▁( in vent or ▁of ▁ 3 1 ▁equal ▁temper ament ▁and ▁cre ator ▁of ▁the ▁F ok ker ▁organ ). ▁The ▁Foundation ' s ▁library ▁poss esses ▁a ▁large ▁archive ▁of ▁correspond ence , ▁scores , ▁books , ▁and ▁other ▁publications . ▁The ▁Foundation ▁presents ▁frequent ▁concert s ▁( origin ally ▁in ▁T ey lers ▁Museum ) ▁present ing ▁contemporary , ▁early , ▁popular , ▁and ▁impro vised ▁micro ton al ▁music . ▁They ▁maintain ▁contact ▁with ▁other ▁organizations ▁dedicated ▁to ▁micro ton ality ▁including ▁T onal soft , ▁the ▁Harry ▁Part ch ▁Institute , ▁the ▁Log os ▁Foundation , ▁and ▁individuals ▁such ▁as ▁K yle ▁G ann . ▁They ▁published ▁the ▁journal ▁Th irty - One ▁and ▁presented ▁Micro F est ▁Amsterdam ▁ 2 0 1 1 . ▁They ▁house ▁the ▁ 3 1 - t one ▁F ok ker ▁organ ▁with ▁new ▁M ID I - conne ctions ▁in ▁the ▁B AM ▁Hall . ▁The ▁current ▁director ▁is ▁S ander ▁German us . ▁ ▁See ▁also ▁Car ril lo - p iano ▁E uler - organ ▁Ac oust ical ▁Society ▁of ▁the