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    <font face="Calibri">I do not think that the usage of the letters
      A-G in the <i>Musica Enchiriadis</i> really can be equated with
      what the 11th-century <i>Dialogus</i> [of pseudo Odo] did. Is not
      it so that the <i>Musica Enchiriadis </i>sequence starts at A
      and continues as far as necessary, and repeats it for a second
      voice, but without giving clear indication as to where the
      semitones are found? This is not utterly different from earlier
      usages [e.g. by Boethius] were the alphabet was extended to as many
      letters as needed. The main difference in the <i>Enchirias</i> is
      that the same lettering is used for the second voice.<br>
      <br>
      The unique achievement of the <i>Dialogus</i> is that it shows
      the organization of the musical system itself, i.e. of all pitches
      available to make music; so doing it repeats a point already made
      by Hucbald, that all music [that they knew] could be made to
      correspond to one single systematic scale. Their aim was not to
      laying out modes, but to show that all modes could be brought back
      to the same [diatonic] scale.<br>
      <br>
      Nicolas Meeùs<br>
      Université Paris-Sorbonne (emeritus)<br>
      <br>
      <br>
      <br>
    </font>
    <div class="moz-cite-prefix">Le 20/05/2014 08:28, Fiona McAlpine a
      écrit :<br>
    </div>
    <blockquote
cite="mid:26DF8EEDFF0108469EF2B17FBC3EA32E7B122956@uxcn10-tdc02.UoA.auckland.ac.nz"
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        Perhaps we should just get rid of Pesudo-Odo, as if he is a
        person, & refer to the C10th treatise <i>Dialogus de Musica.
        </i>In fact the C9th/early C10th <i>Musica Enchiriadis </i>uses
        the letters A-G as a repeating sequence; not, however, for the
        purpose of laying out a mode in a scalar way, but as pitch
        indicators in a diastemmatic-syllabic diagram to show organum at
        the octave, in a way that the <i>Musica Enchiriadis'</i> tetrachordal
        notation never could have.<br>
        <div><br>
          <div style="font-family:Tahoma; font-size:13px">
            <div><font class="Apple-style-span" style="font-size:13px"
                face="'Times New Roman'"><span class="Apple-style-span"
                  style="font-size:medium"><font
                    class="Apple-style-span" color="#800080">(Dr) Fiona
                    McAlpine</font></span></font>
              <div style="font-family:Tahoma; font-size:13px"><font
                  class="Apple-style-span" face="'Times New Roman'"><span
                    class="Apple-style-span" style="font-size:medium"><font
                      class="Apple-style-span" color="#800080">Honorary
                      Research Fellow</font></span></font></div>
              <div style="font-family:Tahoma; font-size:13px"><font
                  class="Apple-style-span" face="'Times New Roman'"><span
                    class="Apple-style-span" style="font-size:medium"><font
                      class="Apple-style-span" color="#800080">School of
                      Music</font></span></font></div>
              <div style="font-family:Tahoma; font-size:13px"><font
                  class="Apple-style-span" face="'Times New Roman'"><span
                    class="Apple-style-span" style="font-size:medium"><font
                      class="Apple-style-span" color="#800080">University
                      of Auckland</font></span></font></div>
              <div style="font-family:Tahoma; font-size:13px"><font
                  class="Apple-style-span" face="'Times New Roman'"><span
                    class="Apple-style-span" style="font-size:medium"><font
                      class="Apple-style-span" color="#800080"><br>
                    </font></span></font></div>
              <div style="font-family:Tahoma; font-size:13px"><font
                  class="Apple-style-span" face="'Times New Roman'"><span
                    class="Apple-style-span" style="font-size:medium"><i><font
                        class="Apple-style-span" color="#800080">Le
                        Béguinage</font></i></span></font></div>
              <div style="font-family:Tahoma; font-size:13px"><font
                  class="Apple-style-span" face="'Times New Roman'"><span
                    class="Apple-style-span" style="font-size:medium"><font
                      class="Apple-style-span" color="#800080">42 Horns
                      Rd</font></span></font></div>
              <div style="font-family:Tahoma; font-size:13px"><font
                  class="Apple-style-span" face="'Times New Roman'"><span
                    class="Apple-style-span" style="font-size:medium"><font
                      class="Apple-style-span" color="#800080">RD 1</font></span></font></div>
              <div style="font-family:Tahoma; font-size:13px"><font
                  class="Apple-style-span" face="'Times New Roman'"><span
                    class="Apple-style-span" style="font-size:medium"><font
                      class="Apple-style-span" color="#800080">Oxford
                      7495</font></span></font></div>
              <div style="font-family:Tahoma; font-size:13px"><font
                  class="Apple-style-span" face="'Times New Roman'"><span
                    class="Apple-style-span" style="font-size:medium"><font
                      class="Apple-style-span" color="#800080">North
                      Canterbury</font></span></font></div>
              <div style="font-family:Tahoma; font-size:13px"><font
                  class="Apple-style-span" face="'Times New Roman'"><span
                    class="Apple-style-span" style="font-size:medium"><font
                      class="Apple-style-span" color="#800080">NEW
                      ZEALAND</font></span></font></div>
            </div>
          </div>
        </div>
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          font-size: 16px">
          <hr tabindex="-1">
          <div id="divRpF817127" style="direction: ltr;"><font
              color="#000000" face="Tahoma" size="2"><b>From:</b>
              Smt-talk [<a class="moz-txt-link-abbreviated" href="mailto:smt-talk-bounces@lists.societymusictheory.org">smt-talk-bounces@lists.societymusictheory.org</a>]
              on behalf of Nicolas Meeùs [<a class="moz-txt-link-abbreviated" href="mailto:nicolas.meeus@scarlet.be">nicolas.meeus@scarlet.be</a>]<br>
              <b>Sent:</b> Tuesday, 20 May 2014 08:30<br>
              <b>To:</b> art samplaski;
              <a class="moz-txt-link-abbreviated" href="mailto:smt-talk@lists.societymusictheory.org">smt-talk@lists.societymusictheory.org</a><br>
              <b>Subject:</b> Re: [Smt-talk] Seven-letter scale notation
              (was re: scale degrees)<br>
            </font><br>
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          <div><font face="Calibri">My mistake, I meant <i>c</i>1000.
              Ps Odo predated Guido by about a generation, 25 years.<br>
              Nicolas<br>
              <br>
              Nicolas Meeùs<br>
              Professeur émérite<br>
              Université Paris-Sorbonne<br>
              <br>
              <br>
              <br>
            </font>
            <div class="moz-cite-prefix">Le 19/05/2014 18:35, art
              samplaski a écrit :<br>
            </div>
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              <div dir="ltr">A couple of digests ago, Nicolas Mee<span
                  style="font-family:'Times New Roman','serif';
                  font-size:11pt"><font face="Times New Roman">ú</font></span>s
                wrote:<br>
                > --[Pseudo] Odo, /c/1100, apparently was the first
                medieval author to suggest the
                <br>
                > notation with seven letters, cycling at the octave,
                which is still in <br>
                > use today, and which for a long time was in use in
                parallel with the <br>
                > tetrachordal/hexachordal naming of the degrees.<br>
                <br>
                A question, and a possible correction.<br>
                 <br>
                Has the dating on "Odo" been revised? I had always
                thought he predated<br>
                Guido of Arezzo by a few years. (The online NGD2 entry
                on modal theory<br>
                still lists him as such, as of 10 min. ago...:)<br>
                 <br>
                Guido definitely uses the seven-letter notation
                system in both the _Regule<br>
                rithmice_ and the _Micrologus_, using an analogy to the
                7 days of the week<br>
                that I believe is also used by Ps-Odo--no access just at
                the moment to check.<br>
                No idea if that analogy is original with Ps-Odo or was
                some sort of common<br>
                coinage--if anyone has info one way or another on that
                I'd love to hear it.:)<br>
                 <br>
                Art Samplaski<br>
                Ithaca, NY <br>
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              <pre>_______________________________________________
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</pre>
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              <br>
              <p class="" color="#000000" align="left">Aucun virus
                trouvé dans ce message.<br>
                Analyse effectuée par AVG - <a moz-do-not-send="true"
                  href="http://www.avg.fr" target="_blank">www.avg.fr</a><br>
                Version: 2014.0.4577 / Base de données virale: 3950/7519
                - Date: 19/05/2014</p>
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      <pre wrap="">_______________________________________________
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</pre>
      <br>
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      <br>
      <p class="" avgcert""="" color="#000000" align="left">Aucun virus
        trouvé dans ce message.<br>
        Analyse effectuée par AVG - <a moz-do-not-send="true"
          href="http://www.avg.fr">www.avg.fr</a><br>
        Version: 2014.0.4577 / Base de données virale: 3950/7519 - Date:
        19/05/2014</p>
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