What’s your favorite extreme “vibe shift” between successive tracks on an album?

Only one rule: the songs have to be next to each other on the album tracklist. Also, please consider explaining the vibe shift for people who may not be familiar with the songs in question 😌

I’ll go first. I assume everyone here is familiar with these tracks but just in case:

I Want You (She's So Heavy) was the last song recorded by the Beatles with all four members present, and is the final song of side one of Abbey Road. It’s a psychedelic rock song bridging on stoner rock, with a Latin blues section. Immediately following the track is Here Comes the Sun, arguably one of the best folk-pop songs ever written.