I'm in a trio playing pretty straight forward rock and roll. I'd like to get the drummer and guitarist to jam out some songs. The guitarist is good at improvisational soloing and is willing to jam out the songs. Some ideas I have are key changes to keys not associated with the songs, time signature changes, or having the drummer (who has some jazz influences) jazzing out his drumming while the guitarist solos. Can anyone give me some very specific techniques on exactly how to take a simple song and do this and whats the best way to explain this to the other band members so we don't have a train wreck?