The Cloud Atlas Sextet

The Cloud Atlas Sextet which, structured like the book as six different scores, overlapping and concluding in reverse order, was deemed un-recordable as a piece of music, or at the very least, they couldn't come up with a suitable score for the movie.
I've resigned myself to this disappointing reality, however they said the theme they composed instead does go through six alterations:

In the end, they scored the Cloud Atlas theme — which Tykwer describes as “Debussy-ish” — several different ways. Just as Tom Hanks, Halle Berry, Hugh Grant, et al. play a multitude of characters, the theme goes through a series of reincarnations.

“We looked at the Sextet, ultimately, as a character next to the characters of people.”

The theme is interpreted six times. Tykwer is giddy at the chance to enumerate them: (1) Frobisher’s initial piano performance, (2) a symphony, (3) a rendition by a jazz sextet, (4) nursing-home Muzak, (5) futuristic Korean street music, (6) a solemn hymn sung by a hoard of clones.