We always feel there are 3 parts to the song. The most important part is the reason it should exist. Our process usually consists of me sitting at the piano & Bob hovering over it. We throw ideas out...I start to play something...he'll hum something to make it better. He'll throw a line to me, I'll twist it to make it better and we scramble around like that for sometimes hours and days, 'til we both agree we've got something to show! That's how it works!