"Trent Reznor wants to be friends on Facebook" — the phrase does not roll off the tongue. But with help from producer Atticus Ross, Reznor has made a solid soundtrack to David Fincher's movie by doing what he's always done: creating grand industrial rock, including a stormy, synth-powered version of Edvard Grieg's orchestral "In the Hall of the Mountain King." It's creepy mood music for the brave new world, where all "friends" are virtual.

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“Oh Sherrie”

Steve Perry's girlfriend Sherrie Swafford was actually in the studio when Perry began writing this song--his lone Top Ten hit as a solo act--with two co-writers. The trio began at midnight one night with just "Oh, Sherrie!" and "hold on, hold on." Three hours later, they had a complete song. Swafford, however, had to wait until the next day to hear it. "Sherrie actually got tired and went to bed," Perry said. She also appeared in the video, but their relationship did not hold on for long.