Lots of different genres.
I really hate most "Christian genre" songs, but there are some I really love. When I love them, they are the most meaningful, but others are amazing as well!
Creed, Rich Mullins
http://www.youtube.com/watch?v=i3i-_VWxOAc
Give Me Your Eyes, Brandon Heath
http://www.youtube.com/watch?v=P5AkNqLuVgY
I Will Follow, Chris Tomlin
http://www.youtube.com/watch?v=DoU8zBQE6Q4
Amazing Grace, John Newton
Trouble Is, Jars of Clay
http://www.youtube.com/watch?v=RRwxBpR9EOA
Wildflower, The Janedear Girls
http://www.youtube.com/watch?v=lYkK9zW41Fo
Hurt, Johnny Cash
http://www.youtube.com/watch?v=XIbepKZC7Po
A Boy Named Sue
http://www.youtube.com/watch?v=_rleFAS_B04
And just about every other song from Johnny Cash
