I printed out the C Pennywhistle notation for The First Noel from Dig. Trad. and I think there is something wrong, it just does not play well/ sound right. I think the problem is in the first two bars of the last stanza. (This may not be the correct terminology but I think you will get the jist) Should there be some higher, different notes in here? Is there something missing? I am not realy musicaly literate but perhaps some tune detective can spot what is wrong and suggest a fix, or can tell me that I am the prob