It's fun to sing songs replacing "baby" with "Katie":
Katie, Katie, where did our love go?
Be my, be my, be my little Katie
Don't worry Katie, everything will turn out all right
Katie you can drive my car
Katie's in black and I'm feeling blue
Try it, you'll have fun, too.
PS - If you're into that whole brevity thing, you can sing Bob Dylan's "It Ain't Me Kate."
PSS - Speaking of Bobs, we in the Fowler home also enjoy a round of that Bob Marely classic, "Pajamas" right before bedtime. Pajamas/I want pajamas with you/Pajamas, pajamas/And we hope you like pajamas, too. Wotcha-wa-wa-wa