Land makes reference to the neutral third attributed to Zalzal (8th c.), described by Al-Farabi (10th c.) as corresponding to a ratio of 27:22 (354.5 cents) and by Avicenna (Ibn Sina, 11th c.) as 39:32 (342.5 cents).
Land cites the neutral third attributed to Zalzal (8th century), described by Al-Farabi (10th century) as corresponding to a ratio of 27:22 (354.5 cents) and by Avicenna (Ibn Sina, 11th century) as 39:32 (342.5 cents).