activities after Adémar's death in 1034, but it was no longer the only scriptorium of the Limousin diocese. William Sherrill made the hypothesis, that the Gradual of St Yrieix with Gallican preces in its appendix (F-Pn lat. 903) has not been written at Limoges, but by the cantors of the Abbey itself which was possible since it promoted as canon chapter during the second half of the 11th century and depended directly of the Monastery of St Martin at Tours. He even went so far to assume that this gradual has copied from Beneventan graduals, because the included Cassinese chants for the patronal feast of St Benedict, and might have served to copy for the gradual of Gaillac, while the latter could have served to write the later gradual for Toulouse. In this comparison the liturgy of the Saint-Martial Gradual (F-Pn lat. 1132) is rather dependent on Cluniac reforms and especially the one of Narbonne, written by the end of the 11th century for the use at the cathedral, resembles to many others written with the same notation in Spain after the conquest of Northern Andalusia, when Aquitanian aristocrats had been related with the Castilian family by marriage. Polyphony was neither invented at Limoges nor did it appear the first time in the notation of its scriptorium. An oral tradition of a polyphonic performance can be traced back to the time, when the Musica enchiriadis had been written, and Adémar was a contemporary of Guido of Arezzo, who described in his treatise Micrologus a similar practice as "diaphonia" (discant), which already allowed to sing more than one note against the cantus during cadences ("occursus"). Notated evidence of alternative practices, where the organal voice changes between different strategies of heterophony (parallel and counter movement) and holding notes which support the modal colour of the cantus, can be found as later added exemplification in monophonic manuscripts of the Abbeys in Saint-Maur-des-Fossés, Fleury, and Chartres. One example concerning the tradition of Fleury Abbey is an addition of an organal voice (similar to the organum notation of the Winchester Troper) in a hagiographic Lectionary (V-CVbav Cod. Reg. lat. 586, fol. 87v) for three Mass graduals «Viderunt omnes» (Christmas), «Omnes de Saba» (Epiphany), and «Gloriosus deus» (Fabianus and Sebastianus). The local style of the cantors were counter movement and holding notes with the syntactic structure underlined by occursus endings. The only exception was Winchester Cathedral,