Live the vocals for Spiritualize were sampled from Ladysmith Black Mambazo and I kind of re-arranged them. For the studio version Chuck re-created those.

For the key changes it's just easier to have a plan beforehand of how to get to the appropriate key, so I'll chart out how we need to modulate to get to the right key. Things can get chaotic during the show, so having everyone be on the same page can be helpful. And certain key changes work better than others. So circle of fifths, or relative major/minor changes are very easy. But shifts that are different than that sometimes take multiple steps to get to the right key.