group which Michel Huglo (1971) called the "Toulouse tonaries" (F-Pn lat. 776, 1118, GB-Lbl Ms. Harley 4951), but also in the tonary of Montecassino. Concerning the earliest fully notated chant manuscripts, it seems that the practice of singing the intonation formulas was soon replaced by another practice, that a soloist intoned the beginning of an antiphon, responsorium, or alleluia, and after this "incipit" of the soloist the choir continued. These changes between precantor and choir were usually indicated by an asterisk or by the use of maiuscula at the beginning the chant text. The psalmody could be indicated by an incipit of the required psalm and the differentia notated over the syllables EVOVAE after the communio or introit antiphon. Cross-references between tonaries during the reforms between the 10th and the 13th centuries Nevertheless, the tonary was not replaced by these manuscripts. While the first generation of notated manuscripts became less and less readable until the end of the 10th century, the production of tonaries as useful appendix highly increased, especially in Aquitania, the Loire valley (Île-de-France) and Burgundy. Probably the oral tradition of the melody was no longer properly working since the early 11th century, or there was still a need in a lot of regions to teach certain cantors an unknown tradition, or the tradition itself had to change under certain innovations of cantors who were in charge of an institutional reform. Studies of the reforms of various regions in Spain, Germany, Italy, and France have found evidence for all these cases whatever was the centre of each reform which had taken place between the late 10th and the 12th centuries. The monk Hartvic added some Dasia signs for certain differentiae as a kind of rubric or comment on the margin (Tonary of St. Emmeram, Regensburg). He knew them from the treatises Musica and Scholica enchiriadis which he copied in this manuscript, and thus he discovered a new way of using them: as an additional explanation or second pitch notation interpreting the adiastematic neumes. The Cluniac reforms and the counter-reforms During the late 10th and the 11th century, the early use of a second alphabetical pitch notation was soon replaced by a new diastematic form of neume notation, which indicated the pitch by the vertical position of the neumes, while their groups indicated by ligatures were still visible. Aquitanian and English cantors in Winchester were the first who developed