Packed with progressive elements, esp. regarding the genre adjective which applies to music - i.e.
progressive rock,
progressive metal, progressive folk, etc. "Progressive" generally connotes virtuosic
instrumentation, incorporation of exotic sounds/instruments, use of uncommon time signatures, unusual/abstract lyrical subject matter, etc.
I'm sort of OK with Coheed and Cambria, I guess, but they are not nearly as proggy as
Dream Theater or
The Mars Volta. They sound like a less-proggy version of Rush, except Rush didn't have an emo
influence.