BTW has anyone noted this relatively recent recording, Rogue's Gallery? Found this review of this 2 CD set of Sea Songs, Shanties, etc at NPR's web-site. Have a look:

NPR Review of Rogue's Gallery

CD includes Sting, Bono, Richard Thompson, Bryan Ferry, Eliza Carthy, Lucinda Williams as well as Loudon Wainwright & Rufus Wainwright & Kate McGarrigle