Editing Guido of Arezzo (section)

===Works===
{{further|Micrologus}}
{{Quote box|width=300px|bgcolor=#E0E6F8|align=right|quote=
'''Works by Guido of Arezzo'''
* The ''[[Micrologus]]'' ({{circa|1025–1026}}){{refn||group=n|name=Dates}}
* ''Regulae rhythmicae'' (after 1026)
* ''Prologus in antiphonarium'' ({{circa|1030}}){{sfn|Atkinson|2008|p=220}}
* ''Epistola ad Michaelem'' ({{circa|1032}}){{sfn|Atkinson|2008|p=220}}

|salign = left}}

Four works are securely attributed to Guido:{{sfn|Herlinger|2004|p=471}} the ''Micrologus'', the ''Prologus in antiphonarium'', the ''Regulae rhythmicae'' and the ''Epistola ad Michaelem''.{{sfn|Palisca|2001a|loc="1. Life"}}{{refn|name=Epistola|group=n}}

The ''Epistola ad Michaelem'' is the only one not a formal musical treatise; it was written directly after Guido's trip to Rome,{{sfn|Palisca|2001a|loc="2. Writings": "(i) Chronology"}} perhaps in 1028,{{sfn|Palisca|2001a|loc="1. Life"}} but no later than 1033.{{sfn|Palisca|2001a|loc="2. Writings": "(i) Chronology"}} All three musical treatises were written before the ''Epistola ad Michaelem'', as Guido mentions each of them in it.{{sfn|Palisca|2001a|loc="2. Writings": "(i) Chronology"}} More specifically, the ''Micrologus'' can be dated to after 1026, as in the preliminary dedicatory letter to Tebald, Guido congratulates him for his 1026 plans for the new St Donatus church.{{sfn|Palisca|2001a|loc="2. Writings": "(i) Chronology"}} Though the ''Prologus in antiphonarium'' was begun in Pomposa (1013–1025), it seems to have not been completed until 1030.{{sfn|Palisca|2001a|loc="2. Writings": "(i) Chronology"}}