Here is the Roman Gradual (Graduale Romanum) from 1974 with the early neumes taken from twomanuscripts: St. Gall (in red) and Laon (in black). This is the result of decades of research by Dom EugeneCardine whose work revealed the beauty and nuance of the Gregorian rhythm. This book contains allthe music for the Mass according to the Roman rite and the revised Roman calendar. This volume isessential for the study of the interpretation of the Gregorian pieces of the Mass. Before each chant, thespecific manuscripts are identified with the page or folio number. This is a great tool for scholars,choirmasters and musicologists and was published by Solesmes in 1979.