Well, I'll give this a shot.. my list won't be very varied. My parents didn't let us kids listen to anything outside old country, pop from the 50s-60s, cajun music and bluegrass, and even some of AKUS's albums caused a mini scandal, with songs titled Let Me Touch You For a While. Hehehe.
Didn't start branching out til I was 20, when I found out mah favorite singer was making an album with the Led Zep dude. So I checked out some Led Zeppelin, loved it, and listened to whatever I felt like since. OK... blah blah blah, here's my list:
Alison Krauss; New Favorite, When You Say Nothing at All, Borderline
with Robert Plant; Polly Come Home, and Please Read the Letter
Led Zeppelin; Going to California, Battle of Evermore
Nickel Creek; Why Should the Fire Die? Seven Wonders, When You Come Back Down
Simon and Garfunkel; Sounds of Silence, Scarborough Fair
Kate Bush; Wuthering Heights, Moving, Suspended in Gaffa
the Duhks; I See You,Turtle Dove, Annabel
Ron Block; Someone, Blackness of the Need..( he doesn't have an amazing voice, but he writes amazing songs )
Collective Soul; The World I Know
Fleet Foxes; Mykonos, White Winter Hymnal
Foo Fighters; Acoustic version of Times Like These
Linda Ronstadt; Blue Bayou (reminds me of home 
)
The Beatles; Hey Jude, Yesterday, Something
the Cranberries; Linger
The Carpenters; Goodbye to Love, Close to You
the Killers; All These Things That I've Done
the Shins; New Slang
Yeah Yeah Yeahs; Maps
Sean Watkins; Let it Fall
Yasunori Mitsuda; Unstolen Jewel Gotta throw a videogame track in here 
Nerd cred.
Instrumental Stuff -
Chris Thile; Raining at Sunset.. Actually ALL of Not All Who Wander Are Lost
Bela Fleck; Throw Down You Heart, The Over Grown Waltz, Three Bridges Home
Jerry Douglas: We Hide and Seek
Bryan Sutton: Walk Among the Woods
Alison Brown; Hello Mendocine, Without Anastasia
This is off the top of my head.
Love this thread, gotta lot of new stuff to check out from it.