Three years ago I spoke to the Grand Bard of Cornwall when he came here. (to Aus) He was very concerned, but mainly sad, about conditions put on him before his American tour a few months before. Although he was allowed to attend a Cornish festival there he was told that he was not allowed to sing any Stephen Foster songs. (Beautiful Dreamer,Jeanie with the Light Brown Hair) Stephen Foster was and still is very popular with Cornish people - probably partly because of the great migrations from Cornwall in the 19th Century. His songs tap into a time of nostalgia and a longing for home.
A slightly different problem, probably, but somehow relevant I think.
Cheers, Joy