||Snow 1977, no. 301: "This (vol. I of the work though the last to appear in print) is the only complete facsimile ed. of Escurial MS J.b.2 and concludes Angles's great work on the music of the CSM. It is from this MS that Anglés made his musical transcriptions (1943), the study of which was completely published later (1958). The copy is unusually clear."