Wedding music...?

My fiance gave me a list of songs he wants played at our reception. I'm downloading music and burning to a disc so we don't have to pay a DJ. Can anyone help me to find FREE mp3, wav, or wmp files for these songs: What a Wicked Thing to Do by Chris Isaac, Feels Like Coming Home by Bon Jovi, Shining Star by the Spinners (we think), and Ain't No Sunshine When She's Gone by Al Green (we aren't so sure about that one). I really appreciate any help you can give.