Nice, DR Elmoore. Is it true the Cy Coleman does his own orchestrations? And what composer (besides Andrew Lloyd Webber) has written his own orchestrations to their shows in the past?
DRMatthew, I don't recall ever seeing Cy Coleman credited for doing his orchestrations, but he's an excellent musician, composer and jazz man, and I'm sure he has a lot of input with his collaborators. He may have scored his albums with jazz groups, though.
Frankly, I don't believe ALW does his own orchestrations; I think he uses excellent ghosts. Victor Herbert, Kurt Weill, Leonard Bernstein, Marc Blitzstein, and Jerome Moross are all I can think of right off the bat, but they all had help:
Victor Herbert scored the things he wanted to do and turned the rest over to Otto Langey and, later, Harold Sanford
Kurt Weill often asked Ted Royal to help him with the more popular and hot dance music
Bernstein got help from Hershy Kay, Don Walker, Sid Ramin, Irwin Kostal, and Jonathan Tunick
Marc Blitzstein had help from Hershy Kay and Russell Bennett on JUNO
Jerome Moross had help from Hershy Kay on THE GOLDEN APPLE
Incidentally, the chamber orchestration for the incidental music to INVITATION TO A MARCH is by Mr Sondheim himself, and I think he acquits himself marvelously.