Mine is loaded with Kenny Chesney, my favorite, and many others. For working out, I have the following songs, they really do keep the mood up and keep me moving! I like a wide variety of music, but generally just put on one of my playlists at the gym, keeps me from fumbling with my iPod all the time.

One Playlist:
Brad Paisley - Celebrity
Dierks Bentlet - Every Mile a Memory
Gretchen Wilson - All Jacked Up
Kenny Chesney - Beer in Mexico
Keith Urban - Blue Jeans
Sugarland - Down in Mississippi (Up to No Good)
Brooks and Dunn - Hillbilly Deluxe
Trace Adkins - Honky Tonk Badonkadonk
The Wreckers - My, Oh My
Kenny Chesney - She Thinks My Tractor's Sexy
Dierks Bentley - So So Long
Faith Hill - Sunshine and Summertime
Keith Urban - Who Wouldn't Want to be Me
Big and Rich - Save a Horse, Ride a Cowboy

Another playlist includes:
Evanescence - Call Me When You're Sober
Gone Daddy Gone - Gnarls Barkley
Kanye West - Gold Digger
Justin Timberlake - Summer Love
Justin Timberlake - Sexyback
Beyonce - Irreplacable
Def Leppard - Pour Some Sugar on Me
Nickleback - Rock Star
Gym Class Heroes - The Queen and I
Willa Ford - I Wanna Be Bad

I saw a playlist in an exercise magazine, I'll post if I can find it for you.