I was going to make this exact same themed mix this weekend. Way to beat me to it, and make a way better one than I. (Our mixes would have shared five songs)

One (Harry Nilssen)
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Aimee Mann
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Two
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The Antlers
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Three S's
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The Avett Brothers
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Four Bulbs
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Admiral Fallow
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Five Minutes
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Dan Le Sac Vs Scroobius Pip
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Six O'clock News
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Kathleen Edwards
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Seven
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Chew Lips
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eight line poem
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David Bowie
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Nine Bullets
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The Drive By Truckers
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Ten Little Kids
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The Jayhawks
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Mornings Eleven
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The Magic Numbers
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There Are Maybe Ten or Twelve
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A.C. Newman
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Thirteen
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Big Star
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Saven, Fourteen, Or Twenty-one Knots
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Califone
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15
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Rilo Kiley
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Sixteen
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Lucero
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17 horses
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Cortney Tidwell
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eighteen
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My Heart belongs to Cecilia Winter
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Nineteen
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Smog
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Twenty Miles
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Deer Tick
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21 Guns (Album Version)
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Green Day