Boy this thread is wandering...
Leonard, tops.
Johnny, great.
k. d. lang does a very good job on Hymns of the 49th Parallel.
Here are other "Bird on a wire covers" noted on Wikipedia...
Joe Cocker on Joe Cocker! (1969) and the live album Mad Dogs & Englishmen (1970)
Tim Hardin on the album Bird on a Wire (1971)
Pearls Before Swine on the album Beautiful Lies You Could Live In (1971)
Rita Coolidge on the album The Lady's Not for Sale (1972)
Fairport Convention on the album Heyday: BBC Radio Sessions, 1968-1969 (1987)
Jennifer Warnes on the tribute album Famous Blue Raincoat (1987)
Tom Cochrane and Red Rider on The Symphony Sessions (1989)
The Neville Brothers on the album Brother's Keeper (1990), also included in the movie by the same name
The Lilac Time on the tribute album I'm Your Fan (1991)
The Bobs on the album Cover the Songs of … (1994), in a skate-punk style
Johnny Cash on the album American Recordings (1994), and also live with orchestra (released on the 2003 compilation Unearthed)
Willie Nelson on the tribute album Tower of Song (1995)
Stina Nordenstam on the album People Are Strange (1998)
k.d. lang on the album Hymns of the 49th Parallel (2004)
autorickshaw on the album So The Journey Goes (2007)
Perla Batalla on the album Bird on the Wire: The Songs of Leonard Cohen (2005)
Kevin Devine live at concerts throughout 2007-2009 and for XFM Wales, December 2007
If you got down this far, my favorite JC in his later days is his cover of Nine Inch Nails "Hurt"
Embedding may not work... click twice or go look for it...