I'm pretty sure all of these have accordions, but heck, with today's technology, it could be a keyboard, or an electric harmonica, or whatever the hell it was that guy from The Hooters played, or Tom Waits humming. Please accept this in the spirit it was meant.
01. Spiers & Boden - "Princess Royal / Cuckoo's Nest" (Bellow)
02. Beirut - "Nantes" (The Flying Club Cup)
03. Calexico - "Across the Wire" (Feast of Wire)
04. The Decemberists - "Engine Driver" (Picaresque)
05. The Gotan Projects - "Una Musica Brutal" (La Revanche del Tango)
06. Kate Rusby - "Wandering Soul" (Girl Who Couldn't Fly)
07. The Zydepunks - "Larideaux a Six Temps" (Exile Waltz)
08. Neko Case - "Thrice All American" (Furnace Room Lullaby)
09. Loudon Wainwright III - "Grey in L.A." (Strange Weirdos: Music Inspired By The Film Knocked Up)
10. Dar Williams - "I Saw A Bird Fly Away" (The Beauty of the Rain)
11. The Pogues - "Honky Tonk Woman" (Essential Pogues)