The Fredösphere

The Guardian says a national musical style is the product of the nation's language.  Composers form melodies that are influenced by the rhythm and pitch forms of the way they speak.  That's plausible to me; I once heard a jazz historian claim that music was based on the inflections in the speech of African-Americans.

For this idea to be confirmed, I suggest further a further study that compares nations that speak the same language.  Britain vs. the U.S. is the obvious choice:  is there a difference in the national styles of those two countries?  (Hint:  yes.)  How do you explain it?  (Hint:  probably the different accents, plus the wider international influences in the American polyglot population.)

(With a tip o' the hat to ArtsJournal.)