B’eB' e neach-ciùil agus teòirigiche ciùil às an Eadailt a bha ann an '''Guido de Arezzo''' (neo '''Guido Aretinus''', '''Guido da Arezzo''', '''Guido Monaco''') (breith [[991]]/[[992]]– bàs [[1033]]) [[beachd-smuaineadair]] anns na [[meadhan aoisean]]. Tha e air fhor mar an innleadair de [[pongas ciùil]] ùr-nòsach a chaidh an àite [[pongas neumach]]; b’eb' e an teacsa aige, am ''Micrologus'' an dara tràchdas a bha sgaoilte is farsaing anns na meadhan aoisean, as deidh an sgrìobhadh aig [[Boethius]].<ref>{{iomradh leabhar | url = https://en.wikisource.org/wiki/A_Dictionary_of_Music_and_Musicians/Guido_d%27Arezzo | caibideil = Guido d'Arezzo | deasaiche = Grove, George | ainm = William Smyth | sloinneadh = Rockstro | tiotal = A Dictionary of Music and Musicians | ceann-là = 1900 }}</ref>
