Hi Seamus,
The earliest recording of the most well known of these I've found is probably by Tommy Jarrell, you'll find it on youtube under the title 'As Time Draws Near'
Tommy Jarrell-As Time draws near
Bruce Molsky has produce some of Tommy's work in a more accessable style and the most well known version(and the basis of much that followed) is with Julie Fowles, also on youtube.
Bruce Molsky with Julie Fowlis - The Blackest Crow
I did a recording of 'Dearest Dear' by Cath & Phil Tyler a while back, you'll find it in my audio list. I'll try and do a sound clip of the others when the block's a bit quieter.
Another Tommy Jarrell I've been looking at lately is Train on the Island, also covered by Bruce Molsky. Nearly got it.
Similar story here, there are a heap of bluegrass style recordings of this tune, as well as it being sung to the tune of 'June Apple'.
Here's my favourite played on Nepalese Sarangi and clawhammer banjo -
https://soundcloud.com/hilary-dirlam/train-on-the-island-american-fiddle-tune [edit] looks like you need to click the second part of the link
updated by @john-p: 08/29/15 10:26:47PM