About: http://webisa.webdatacommons.org/343006545

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	All are on CD except the first two issues (gradual and tract), which included lengthy commentary in German; the CDs were planned to replace the commentary with more chants, but they have never been issued.
http://www.w3.org/ns/prov#wasQuotedFrom	arkivmusic.com