I saw a video a couple of years ago on YouTube about Brian Wilson's insistence on doing the double 12-string intro to Wouldn't It Be Nice in a different key than the rest of the song. And how he argued with others in the session about it. And about arranging the song so that different players in the session were in different keys at times. Does this ring a bell for anyone? It's not the hour long documentary by that name. As much as I love this video... this is not the one I'm talking about (but PLEASE watch this one if you have never seen it).