A famous example is " Nuper rosarum flores " by Guillaume Dufay, where the tenor ( notated all in longa and a few breve values ) is performed first as tempus perfectum ( ), then tempus imperfectum ( ), then tempus imperfectum diminutum ( ), and finally tempus perfectum diminutum ( ), leading to length relations of 6 : 4 : 2 : 3 between the four repetitions.
22.
Still, the symbols for time signature never completely lost their association with tempo ( they still have it-- " cut time " certainly implies fast . ) I don't know of any contemporary survival of the reversed cut-time symbol ( those symbols themselves are survivals of the mensural symbols of the Middle Ages-- e . g . the " tempus perfectum ", a circle, triple meter; and " tempus imperfectum ", a half-circle, two-to-a-bar ) . ( talk ) 03 : 24, 5 December 2008 ( UTC)
23.
However, the researches of Blume ( 1908 ) show that the primitive Benedictine cycle of hymns, as attested by the Rules of C�sarius and Aurelian of Arles, did not include these hymns, but assigned for Terce, Sext and None ( for Eastertide ) the hymns : " Jam surgit hora tertia ", " Jam sexta sensim volvitur ", " Ter hora trina volvitur "; the earliest MSS . of the cycle give for these hours, for the remainder of the year, the hymns : " Certum tenentes ordinem ", " Dicamus laudes Domino ", " Perfectum trinum numerum "; while other MSS . give as variants for Lent : " Dei fide qua vivimus ", " Meridie orandum est ", " Sic ter quaternis trahitur ".
