I always love a good songwriting banter. How do you guys approach it? For me its a cross between improvisation and thinking of the big picture so I basically just jam to come up with cool riffs, consider the type of beat/section is most suited to it (I.e. create a full band "part" from it) and then structure the "parts" together so that they flow nicely. I hardly ever worry about tempo changes or time signature changes to a large extent either because I find by adding/subtracting multiples of 15 (I.e. 15, 30, 45, 60) to the tempo you can pretty much fit anything together and I like that kind of variation in songs. What screws me up most is that because I do more traditional rock based stuff with my woman it can be hard to break from verse/bridge/chorus/repeat/solo/end structures sometimes and that rarely works for my own stuff.