The only truly legendary theme I can think of that outclasses them all is The Legend of Ashitaka from its original restricted album: it brings this sensation of getting sucked into a whole other world and existence, like you're about to be there for a while (the theme after half way.) So cinematic, how Hisaishi folds the v-ii keychange into the melody. That unexpected G minor! it's like he's trying to bend metal. So wistful. Do you know of any legendary music that comes close to this? What is 'legendary' to you?

Please feel free to post anything. I find a lot of legendary music often from Japanese composers, for example, this melody at 2:00 sounds very 'legendary' but it's not both grand/epic and legendary like the above. That's why I don't post it as our benchmark.