MM -
You are using a Master Interpreter of Music. In this connection, I feel as though he was showing the struggle of life as blues music. Thoroughly confused now. Is it a lullabye or a blues? Maybe both. Which one will dominate?
Joe, it could be both. Blues is an idiom, while a lullaby is a genre, and a song with a particular purpose--to get the kiddy to slow down and go to sleep, secure in the knowledge that he is loved and protected.
As I understand it, strict blues has a particular kind of chord progression and an A-B-A structure, so in that sense, "Summertime" is not blues, though it can be "blues-y," or blues-tinged. It can also be re-orchestrated so it sounds even more like blues.
What it is more truly is jazz. Jazz is a huge river, of which blues is just one feeder stream. Gershwin used a lot of jazz idioms in his work, because he felt that jazz was a uniquely American form. The work that "Summertime" is from,
Porgy and Bess, was designed to be a jazz opera, and when it's performed in its original form, it's sung by opera-trained voices. But "Summertime" is often interpreted in a whole host of different styles, with more jazz-pop voices. I bet we could find an interpretation by Ella Fitzgerald somewhere, for instance.
What I'm getting at is that there are a lot of versions of "Summertime" out there, both vocal and instrumental arrangements, with a lot of different moods, which means that many different skaters could bring something special to it. Torvill and Dean used a marvelous orchestration of it (a harmonica, performed by Larry Adler). Plainly this ain't no lullaby!
http://www.youtube.com/watch?v=EmztHpSIT4E