Toucha Toucha Touch Me

Spooky key change from the Rocky Horror Picture Show. Half step up at the end. Take it away Janet.
-Tony

Rebel Rouser

Half step modulation throughout the song. Note the instruments that come in and out with every key change.
-Tony Trov

I Got You Babe

Half step key change after the bridge. Nice job Sonny.
-Vivas

Keep Yourself Alive

The chorus of this song rocks it in D major, jumps to F major at the end of the song, goes back to D and then visits B major on the last time around. Oh Mercles, you rule my world. Queen is the best at what they do. Best part of the video is Brian May singing.
-Nick

Sweet Thing

It's not surprising that Rufus & Chaka Khan's "Sweet Thing" is one of the most soulful songs ever written, as it features the Queen of Soul Herself on vocals. The sunny, uptempo-but-relaxed groove is in A until about two minutes in, at which point it modulates up a half-step to Bb. Complete flames.
-Mike

Fire

Cleverly stealing his chorus from Cool Jerk, his Greatness takes the second solo a whole step above the key of the rest of the song at 2:15 in the outro. Move over Rover...
-Nick

Little Green Bag

Here's a fun one from the George Baker Selection. The key goes from G up half a step to G# just before the last chorus. And here's a weird video of George Baker and said selection drinking wine in what looks like a pizza kitchen.
-Al Bruno

Kenny Rogers & The First Edition

Kenny Rogers group from the 1960s gives a mean half step key change at the beginning of each verse.
-Frankie

The Sign

I saw the key change and it opened up my eyes.
The intro segment starts in G Minor and switches to it's parallel major of G Major when the lyrics come in.
-Kristen