You might take a look at this video recorded by Gibb Sahib (where is he when we need him on this thread?) under the name hultonclint at Mystic Seaport. Here Shenandoah has morphed into a rowing chantey with religious overtones (my interpretation, anyway), and Missouri has become Misery. The song starts at about 5 minutes, but the whole demo is interesting. Stick with the clip until the end where you'll hear the words more clearly in a concert presentation.
BTW, someone from that state told me that whether you say Miz-or-y or Miz-or-a depends on the part of the state in which you live.
https://youtu.be/xq4SMyj4R_I