If "all music is tradition" then either

- all music is equally traditional

or

- all music is traditional, but some examples are more traditional than others

If it's the first, then the word 'traditional' doesn't mean anything and there's no point talking about it.

If it's the second, then we just need to stop saying "traditional" and say "very traditional" instead - and start saying "not very traditional" instead of "not traditional". Or else we could stick with "traditional" and "not traditional", and leave it to anyone using Blandiver's definitions to translate.