Welcome to my first post! It's short 'n sweet and I will definitely be back for more. "If I knew you were coming I'd have baked a cake" was a song that my mom taught me as a young girl. She sang songs all the time, and I'm sure she sang this one while actually baking a cake. I think about it every time I pop a sheet cake, a tin of cupcakes or the like into the oven.
Here's a well known version of the song - Enjoy!