For diversity to live long, Steve, we need Greeks to keep playing their bouzouki, Italians their mandolin, and English our cittern

Nonsense. What is needed for TRUE diversity is for the bouzouki, mandolin and cittern to be played by ANYONE regardless of nationality. What you are saying smacks of restricting certain nations to play only their national instrument. You will be telling us next that black people should only perform work songs and sprituals or that Jewish people should only perform Klezmer. I seem to recall that a certain nationalist leader in the 1930s had that idea shot down by lovers of freedom. Literaly.