measured, though presence of minim tails is always due to a later hand, Ars Nova on f. 8. Feature is frequent use of rhomboids; plica popular; accidentals rare

six red five-line staves per page in score, but usually 7, 8, or 9 in parts

170 folios numbered in modern ink at t.r.r. by the photographer from Silos when he took photos for P. Aubry in 1906. The photographer wrote the number 124 twice, so that his foliation runs from 1-169 only.

parchment

RISM B/IV 1: A parchment codex completed c. 1325 or a little later meas. 260 x 180mm. The writing-space varies from 153 x 132 mm. to 235 x 130 mm. This wholly musical manuscript consists of 170 folios which were numbered in modern ink at t.r.r. by the photographer from Silos when he took photos of the newly found source for P. Aubry in 1906. In fact, two monks from Silos, Dom Lucia Serrano and Dom Cassia Rojo discovered the codex in 1904. The photographer in question wrote the number 124 twice, so that his foliation runs from 1-169 only. The binding is of wooden boards a centimetre thick covered in white leather. A 14th century parchment flyleaf at the beginning is unnumbered and contains fragments of two plainsong Glorias. There is a mixture of score and part notation, so that the red five-line staves amount to six per page in score but usually seven, eight or even nine in parts. The notation is measured throughout, though the presence of minim tails is always due to a later hand. The main part of the ms was written by one hand (f. 1-7v, 8v-152v, 157-159 [first stave], 161-161v, 166-167v), while the fragment in Ars Nova notation on f. 8 was certainly due to a slightly later hand. Anglès distinguishes 11 further hands from f. 153 to the end. Whoever was the main copyist, Johannes Rodrigues, whose name appears several times in the margin near the end, was evidently one of the later compilers and editors. A feature of the notation is the frequent use of rhomboids, unusually with the meaning of an ascending binary ligature c.o.p. The plica is extremely popular in this source, but accidentals are rare. Initials are in either blue or red or both, rarely in brown. 19 fascicles make up the manuscript's 170 folios, consisting of 3 quinios, a bifolio, 8 quinios, a quaternio (originally a quinio), 3 quinios, a quaternio, a ternio and a half, and finally a bifolio with two single folios. The last three fascicles have undergone certain displacements, and the correct order of the pages should be f. 152, 166, 167, 157, 158, 161, 159, 160, 162, 165, 153-156, 163,164 and 168. This order has been followed for the list of works. The codex seems to have been in the possession of the monastery from the beginning, for there are conductus written for the founder of Las Huelgas, Alfonso VIII, and abbess Maria Gonzalez. The remarkable collection of liturgical music in Hu covers most of the forms popular from the 11th to the early 14th century, organa, motets and conductus of the most varied kind, though the total of 186 compositions listed by Anglès includes many monodies and some pieces without musical notation.mo

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