There are a fair number of folks of Welsh descent in the Philadephia area, and there are even Welsh place names in the area(such as Bala Cynwydd)--though smaller in number than the many Scots and Irish communities, they are equally interested in all aspects of the old culture, and there is much interest in reviving both music and language--(New Jersey is in the Philadelphia area, as well)--

I once attended concert for a visiting Welsh Men's Choir, who made the mistake of performing a repertoire of American songs, thinking that that is what Americans would want to hear--at the break, they found that audience were mostly of Welsh extraction, and wanted to hear the real stuff, in the mother tongue--they were more than happy to oblige!