Answer:
These are some songs that i know for sure katey sagal sung a rendition of son of a preacher man in the first season, along with a rendition of ruby Tuesday in the second season. The theme song is called "this life" by curtis stigers. another they usually play during scenes for next week is called "sun's gonna rise" by citizen cope. Also featured was a song called "some day never comes" by billy valentine. The last one that i know is called "Mary" by patty griffin. sorry i couldn't tell you every single one but those are the few that i know by heart:)