The basic formula for my band's sessions is the keyboard player picks a voice on the keyboard, which determines the style of music (often something laid back and funky), I pick the key and the drummer starts the song then KB player and I drop into the song. Also, because the KB player's dad has a home studio we usually record a practice version and proper version (although these two are often quite different as we're just jamming). Everyone in the band loves this setup. However whilst we all love jamming, we all see the band going in the direction of performing a setlist of songs at bars and festivals. How can we turn these no structure songs into setlists? Do we have to start writing chord changes?