||Snow 1977, no. 170: "The text, so far as I know, has not been preserved but the information is incorporated into Anglés's full study of this question (1958). The illustrations for the lecture were preserved and printed (Barcelona: A. Boileau y Bernasconi, 1939. 4 pp.). These include the J.b.2 notation of the incipits of CSM 179, 28, 10, 57, 2, 159, 292, 24, 303, 209, 353, and 47. It was through A.'s study of musical notation of the Alfonsine MSS that his decoding of the songs of the troubadours and the trouveres was made possible."