I am in a just-starting-out three-piece band after a long hiatus from band playing, and it's my first time playing bass in a band after playing guitar for most of my life. I am having a blast and feel like I'm getting the hang of it quickly enough and all that...but I still think in guitar when it comes to contributing song ideas (we're working on original material). In a past band one of the guitarists and the bassist would swap instruments for some songs, and I always thought in that setting it was kind of jarring; while both guys could play in time and in tune on either instrument, the whole vibe and feel of the ensemble changed and I was never entirely comfortable with it. Now when I come in with a guitar idea and show it to the guitarist, chances are good he'll want to just swap instruments rather than take my guitar part and run with it. Do any TB members have good/bad anecdotes or advice to share on swapping instruments while maintaining momentum through a set, and not turning the whole band dynamic upside down after the swap?