text: {"frequencies":[261.6255653006,276.86979852503,294.32876096318,310.07474405997,331.11985608357,348.83408706747,369.15973155124,392.4383479509,415.30469757995,441.49314144476,465.11211608996,492.21297564769,523.2511306012],"description":"Marpurg's temperament nr.4, 2 tempered fifths"}