How to turn off the Front Row keyboard shortcut

fn + return works while navigating with the up and down keys. Edit the song, then press return again to submit changes.

For the other columns just press tab to reach the desired column.

Control+Shift+Power For current Mac keyboard layouts. Control+Shift+Eject works for older keyboard layouts that still include the Eject key.

This page explains some alternate solutions as well.

Also, if you have "Require password after sleep or screen saver begins" set to immediately in System Preferences -> Security & Privacy, it will ask you for your password after doing this.