A work that always makes me wince: the suite from _Les Sylphides_, which is orchestrations of Chopin by (according to the page I looked at) Alexandre Glazunov, Igor Stravinsky, Anatole Liadov, Nicolas Sokolov and Sergei Taneyev. I don't know if this has a life in the concert hall apart from its use as a ballet score. One could add other things like Britten's _Young Person's Guide to the Orchestra_ which is based on a theme by Purcell. There's a distinction to be made (with a fuzzy area in the middle) between a composer's own variations on/exploration of a theme by another, and a more straightforward arrangement/re-orchestration/transcription of someone else's piece. Both types occur in your list. There are lots more examples of the former: just look at Beethoven's piano variations, for example. Virginia Knight Personal homepage: http://www.ilrt.bris.ac.uk/~ggvhk/virginia.html Blog (mostly about singing): http://devbox.ilrt.bris.ac.uk/~cmvhk/blog/