+1 for American Tune. I particularly like the Willie Nelson/Paul Simon duet on Willie's "Across the Borderline", a great album which also includes a duet with Dylan on Heartland.
But if you want something that "gets you" every time, there's nothing like the Playing for Change video series that can be found on YouTube. If you haven't seen them, each video blends clips of local musicians from around the world, many of them who are street musicians, playing a song often featuring a well known artist. Here are some of my favorites (but they're all terrific):
Gimme Shelter (Taj Mahal)
Teach Your Children (Tula Ben Ari - female singer from Israel with a great voice and vocal style)
Ripple (Bill Kreutzmann, David Crosby, Jimmy Buffet, David Hidalgo)
The Weight (Ringo Starr & Robbie Robertson)
Listen to the Music (Tom Johnston) - Outstanding!!
Guantanamera
Stand by Me
Higher Ground
Get Up, Stand Up (Keith Richards & Keb Mo)