Mouthy, I am doing the same thing today. Some really great music on this thread!!! I'm inspired to add a few more.
Harvest Moon:
http://www.youtube.com/watch?v=RMA-_ElvKsk
All things Fiona Apple. This one is Across the Universe originally composed by the Beatles.
http://www.youtube.com/watch?v=AZ5WPXxNzPU
NIN Hurt:
http://www.youtube.com/watch?v=htmKZKR7oyc
Jim Croce, Time in a Bottle:
http://www.youtube.com/watch?v=dO1rMeYnOmM
All things Sia Furler:
"My Love" As a disclaimer: I do not like Twilight.
http://www.youtube.com/watch?v=mtM_cc4SPJI
George Jones, Willie Nelson, Johnny Cash have already been mentioned, nice. I love/moved by Pearl Jam, Elton John, Sarah McLaghlan...I could go on and on...the list is endless. I think I found my favorite thread!