Originally Posted by tore

For much of the prog I listen to, those elements are not really very good descriptors at all. Going by that list, Mighty Rhapsody is probably more prog than most of the prog I listen to!

Something that further complicates any want to rigidly define a genre like prog rock as anything is that once a band is considered prog, that label is also generally applied to much of that band's output, often even when it doesn't contain those elements.