Ain't We Got Fun

Marsha Summers on vocals and piano and Mike Tarrani on drums at Building 18, Bishop's Glen in Holly Hill, Florida on February 12, 2015. The song was composed by Richard A. Whiting, with lyrics by Raymond B. Egan and Gus Kahn. It was first performed in 1920, but not published until 1921.
The lyrics sound frivolous, but are actually an oblique protest about poverty and class distinctions. The song and/or some of its lyrics have wound up in interesting places, including in F. Scott Fitzgerald's The Great Gatsby, a Dorothy Parker short story (Big Blonde), and even by George Orwell who cited the lyrics as an example of working class unrest.
Despite all of the above, it's still as much an anthem of the "Roarin' 20s" as The Charleston.