Jimmie Lunceford is one of my favorite bandleaders - he's the guy responsible for barnburners like "White Heat" and "Lunceford Special". There's a playful quality to his music, and this song is no exception.
"Ain't She Sweet" recorded by Jimmie Lunceford and his Orchestra (1939)
I wasn't joking when I said I like when the band sings, right? In case you weren't sure, according to the record label you should fox-trot to this song.
And just for fun, here's a couple other versions of this song.
"Ain't She Sweet" recorded by Gene Austin (1927)
"Ain't She Sweet" recorded by The Beatles (1961)
Which version is your favorite?