On the 20th Century is an all American 1930’s musical with book and lyrics by Betty Comden and Adolph Green and music by Cy Coleman.
It has all the characteristics of the golden age of musicals, cool sets, colorful costumes, cheery chorography, plus Kristin Chenoweth. She and co-star Peter Gallagher are wonderful—hamming it up mightly.
As for the plot, I could explain it to you, but it’s not really relevant. Fun, Fun, Fun.