I've often wondered whether Dudamel does modifications to existing arrangements. I have heard him do some of the traditional works (I am not fond of his fascination with contemporary composers) in a way that sounds "different" to me. I am not a musician and can't tell you "how it is different" but having grown up with a founder of the Cleveland Symphony, I have a fairly good feel for when a work has a "different" approach. In the case of Dudamel, I have liked his conducting style and the "flavor".Only in classical music, though, do you find arrangers who are just as dead as the composers, and for 75 years or more! The most popular rendition of "Pictures at an Exhibition," composed for piano by Mussorgsky, who died in 1881, is the orchestral arrangement by Ravel, who died in 1937.