I own all three of their masterpiece: Dummy, Portishead, Live At Roseland. Yes, their third album was a live version of their previous songs, but the sound is superior to already classic musical compositions. Beth Gibbons sends chills once her voice come through the microphone, along with the dark soundscapes (reminiscing of RZA's early production) provided by Geoff Barrow. I promise if you love classic albums, you must pick up Portishead.
Undefined, Over, Roads, Pedestal, Glory Box, Wandering Stars, Roseland NYC Live (the album)>>>>>>>>>>>then everything else out there.