I had an idea for a topic today, as I was listening to music...

What are your favorite parts of a song? Not so much for the lyrics, as for the music itself. And not even necessarily your favorite song, but any that has a certain portion you love to hear - the most common reason would probably be because of a great solo, but also think of cool transitions, like a shift in tempo, a new instrument coming in, etc. Kind of like the part that you look forward to, when you're listening. I know I'm doing a poor job of setting this up, so let me just share some of mine:

Led Zeppelin - The Rover - 3:13
http://www.youtube.com/watch?v=_JybkqBGrVs

Led Zeppelin - Bring It On Home - 1:40
http://www.youtube.com/watch?v=wz4gRjI-HRA

Pink Floyd - Time - 2:30
http://www.youtube.com/watch?v=MYiahoYfPGk
The entire intro leaves me in anticipation of this part.

Queen - Fat Bottomed Girls - 1:30
http://www.youtube.com/watch?v=GOnw1JMw7yA

Rolling Stones - Gimme Shelter - 3:00
http://www.youtube.com/watch?v=ZYIUgdD9gj8
I found this piece of trivia from the Songfacts site: At about the 3:04 mark, when Merry Clayton sings the high note on "Murder," you can hear Mick Jagger in the background saying "Whoo!" - after reading this and noticing it, I now always listen for it in the song!

I'm sure I can think of more, which I'll add...
What about you?