The "We Can Do It Together" music was commissioned by SDC, written and recorded especially for the American Plunge, by whom I couldn't say, but it was part of the AP from the beginning. As we were finishing up on it's construction during the last month before it's opening, it played incessantly on a loop, and those of us on the construction crew got really tired of it. I haven't been on the ride since they rebuilt the "cave" part, didn't even know that music had been scrubbed, and I can't say anything about the "new" characters.
The "daredevil" theme, if you want to call it that, in the cue line was original also, although I'm not sure it was limited to Ozarkian daredevils. I seem to recall one "billboard" that described a fellow that went over Niagara Falls in a barrel. I don't know if the original intention was to promote "daredevilry"...I always thought it had more to do with pointing out the American spirit of adventure.