disputed and under referenced i have applied two tags does gamut ever mean the same as hexachord i think this gets the relation between the concepts wrong the long section middle ages lacks references entirely i would recommend grove as a first resource but it would be good to include others i fear that some of the text in this section may not be original also the references in the next section are inadequate we need much fuller bibliographic details than this and more standard formatting i'd attend to these things myself and may yet do so but right now i am tied up with other things noetica talk