I've been working on this tune of late and noticed something interesting about the way Kurt generally performs this tune. All of the versions I've listened to other than Kurt's perform the song as a ABAC 32 bar song form. This is how it appears on song sheets too (Real Book 2 as well as the Standards Real Book). Both the recordings I have of Kurt performing this tune the C section is augmented to be 16 bars instead of 8 bars with the melody being stretched out to fit the new harmonic rhythm.
Is there an older recording of this tune where this is the way it's performed? What's the inspiration for that part of the arrangement? Learning the tune really made me curious. Obviously anyone can chime in with their ideas.