This volume by Walter van de Leur arrived yesterday. What I mainly was interested in it seems to deliver, and quite well: analysis and critique of the music.
David Hajdu's Lush Life was very good on Strayhorn the man. This has the goods on the composer, starting with student compositions and through the Ellington years and beyond. Many examples, culled from Strayhorn's manuscripts, are provided. There is also discussion of Strayhorn's contribution to Ellington's book, specifically who actually wrote what.
Probably this would be best appreciated by composer/songwriters or students---or Strayhorn completists.
Thanks Larry Kart for making me aware of the book...
Here's a link to purchase it on amazon.com: https://www.amazon.com/Something-Live-Music-Billy-Strayhorn/dp/0195124480/ref=sr_1_1?s=books&ie=UTF8&qid=1470251657&sr=1-1&keywords=something+to+live+for+the+music+of+billy+strayhorn