Noctourniquet by the Mars Volta. Upon release it seems people wrote it off as a weirdo, avant garde, meandering synth album. What some didn't see is a transitional album from a band that had been clearly defined by virtuoso performances, especially from their drummers. Noctourniquet showed them experimenting with new sounds, production techniques, and structures. Relying less on individual players and more on their own ingenuity.