have just read the article in living tradition,couldnt find your letter.
I Think Ewan Maccoll acted incorrectly in interrupting a performer,and telling him to sing songs from Austria,The correct thing to do would have been to wait until people were leaving the club and then had a quiet word of explanation about the clubs policies.
If anybody interrupted me while singing a song,and tried to tell me what to sing,Iwould take strong exception to it.