Into season 5 of Fringe now and we've skipped about 20 years into the future - the evil Observers have taken over and have made of the Earth a dystopia. The main characters are awakened from stasis in amber, unaged, and have joined the resistance to find a way to get rid of the bad guys. Walter is captured and interrogated in a scene reminiscent of Agent Smith's questioning of Morpheus in The Matrix. The thing that helps Walter make it through the mind-reading interrogation without going crazy is his concentration on music, which is alien to the Observers ...
Observer: You're trying to think of music. You miss music.
Walter: There's not a lot of it here.
Observer: We tolerate it. But it's merely tones, rhythms and harmonic vibrations. I don't understand it.
Walter: Mostly it amazed me. Music helps you shift perspective, to see things differently if you need to.
Observer: See things like hope?
Walter: Yes, very much like that.
Observer: But there is no hope for you. Nothing grows from scorched earth.
Walter is eventually rescued, ravaged by his experience, but the episode ends like this ...