One of the choirbooks , previously thought to be lost , was discovered in the Guatemala City cathedral following an earthquake in 1976 . In 1996 , it was published by University of Chicago Press in a complete modern edition with an accompanying study by the musicologist , Robert J. Snow ( 1926-1998 ) , under the title '' A New-World collection of polyphony for Holy Week ; Guatemala City Cathedral Archive , Music Ms. 4 . '' Dedicated to Robert Stevenson , the book contains music for Holy Week and Lenten Salve services and includes four settings of the Passion and two unique settings of the Lamentations of Jeremiah the Prophet . Amongst the composers represented are Francisco Guerrero , Cristóbal de Morales , Hernando Franco and Pedro Bermúdez . In order to encourage the use and spread of this music the University of Chicago Press rescinded their copyright for performance purposes
an earthquake in 1976
1976 Guatemala earthquake
Guatemala City Choirbooks