Although the Transatlantic Sessions (series 3) have very recently disappeared from the BBC iPlayer, I suspect that they will be repeated and available again before too long. If they are, then I very strongly recommend watching at least episode 5 - 22 minutes into that, Allison sings Carrickfergus and it's as close to perfection (i.e. Emmylou's Goodbye!

) as possible - and it's live, to boot! It really is sublime and should be prescribed to anyone feeling down. It would be wonderful if it could be released as a single or put on a live album. She was on episodes 2 and 4 as well - and I've just realised that (of course!) Carrickfergus and Mockingbird are on YouTube now - don't miss them!
I must admit that this was my introduction to Allison, but I'm catching up quickly - and am annoyed at how I've missed out on hearing her before.