I disagree that vowel harmony is the place to discuss i mutation in Welsh I see no reason why this article or umlaut and a mutation for that matter should be restricted to Germanic I think this article should be about any fronting raising process triggered by a following high front vocoid regardless of what language it s attested in Likewise a mutation shouldn t be restricted to Germanic but should include lowering caused by a following a in other languages as well again an example from Welsh gwyn white masc windos vs gwen white fem wind Umlaut should mostly be about the written sign with an indication that it also the name for processes like i mutation and a mutation Vowel harmony should be about the left to right processes typical of Uralic and Altaic languages That s what I think comhr