Brad Warren told Roughstock
that the part they wrote for the girl, "Is just the voice on the radio." He explained: "It's about the person you're singing about in the song or singing to in the song is driving down the road. It says 'and the song says' and she comes in with 'I can't live without you, baby.'"
"We wrote the girl's part as just the voice on the radio," continued Warren. "It's not actually part of the lyrics; it's just looked at as a voice on the radio. Then it kicks into the regular chorus. That's one of those tricks you learn when you've been around for 20 years [laughs]! We've written all the way to the wall of goodness, and now we're on our way back ... so it's getting worse."