"If it said that the black contribution was more important than the white or the white more than the black then yes, it would be racist."

I can't see that there's anything racist about saying that the black contribution to Jazz was more important than the white contribution.

The way Irish music has developed ovwer the past few decades owes quite a lot to influence from the music of other cultures and of people of various colours, but it's still true to say that the Irish contribution is still more important. You could say the same kind of thing about Klezmer music for example. All kinds of influences and borrowings - but the Jewish contribution is still the most significant.

(However anyone who writes "the white man" at this time is intentionally trailing a coat and saying "go on, say I'm racist..." And the best thing to do to that kind of thing here is, turn away from it.)