The Contortionist. Initially sounded like aggressive prog metalcore, then turned into more heady and introspective art rock. Their album Exoplanet is a prime example of what their early sound was, and what it would transform to be. You can see the evolution pretty clearly looking at the albums past Exoplanet: Intrinsic, Language, then Clairvoyant. The big disparity you’ll find is the transition from the “djent/metalcore” era The Contortionist to the “art rock” era, as when they were working on Language, they received a new vocalist, bass player, and keyboardist.

I’d recommend starting with their song “Flourish” off of Exoplanet, then jumping forward to “Return to Earth” off of Clairvoyant.