Classical texts almost ceased being copied in the period between the mid sixth century and the Carolingian revival. Horace's work probably survived in just two or three books imported into northern Europe from Italy. These became the ancestors of six extant manuscripts dated to the ninth century. Two of those six manuscripts are French in origin, one was produced in Alsace, and the other three show Irish influence but were probably written in continental monasteries (Lombardy for example). By the last half of the ninth century, it was not uncommon for literate people to have direct experience of Horace's poetry. His influence on the Carolingian Renaissance can be found in the poems of Heiric of Auxerre and in some manuscripts marked with neumes, mysterious notations that may have been an aid to the memorization and discussion of his lyric meters. "Ode" 4.11 is neumed with the melody of a hymn to John the Baptist, "Ut queant laxis", composed in Sapphic stanzas. This hymn later became the basis of the solfege system ("Do, re, mi...")an association with western music quite appropriate for a lyric poet like Horace, though the language of the hymn is mainly Prudentian. Lyons argues that the melody in question was linked with Horace's Ode well before Guido d'Arezzo fitted Ut queant laxis to it. However, the melody is unlikely to be a survivor from classical times, although Ovid testifies to Horace's use of the lyre while performing his Odes.