Hi all! I hope this is  the right lounge for this topic, I joined long ago but haven't really visited this forum since. I didn't find any earlier topic that was about this matter, but maybe I was just too lazy to search...  sorry, if this is already treated subject.

When talking about making a big prog-piece, I find that many of those songs are kind of a chapter-based songs, with no true musically thematic continuity in them. This is not necessarily a bad thing, of course, but I was wondering if there are some bands/songs, that use their musical ideas and themes "economically" as in sense of classical music, in forms of variating and modulating the main theme, or in some other inventive ways. Can anyone give examples of this kind of prog-pieces?  It would be fun to try to make something musically big, though economical.

you forgot to say "search the internet"

Do you have any opinion or examples of certain pieces using it's material really efficiently? I was thinking more of classical/symphonic or eclectic prog bands that are good in this sort of music making.