I'm hoping to compile a list of cues from various films that underscore the artist at work, ideas being formulated, and montages of same. In fact, the cues don't necessarily have to accompany the images, just so it has that same sound.
To get things started, here's one from Jeff Beal's score to POLLOCK (which inspired the thread):
What I like about Beal's effort, in that it not only underscores the scenes brilliantly, but it also captures an Americana vibe, seeing as the film is about an American artist.
Off the top of my head, James Horner's "The Machine Age" from Bicentennial Man, and "Creating 'Governing Dynamics'" and "Cracking the Russian Codes" from A Beautiful Mind, seem to fit the bill. Here are the cues, along with the scenes they accompany, respectively:
Khachaturian via Burwell. Brilliant. I weep every time.
Also -- my least favorite film in the Three Colors trilogy, but very much about creativity and rebirth. All three films featured beautiful, inspired compositions by the woefully underappreciated Zbiegnew Preisner.
Perhaps not the creative process exactly, but the way that Horner scores the chess game scenes in SEARCHING FOR BOBBY FISCHER always seemed to me like a great musical statement of the internal life of the mind.
I can't find the scene on youtube, but the 'Graysmith Obsessed' sequence from David Shire's ZODIAC is a great piece of scoring. In it, Graysmith (Jake Gyllenhall) pores over the evidence from the Zodiac attacks.