For some brands, an audio logo is just as important as a visual one. Close your eyes, and you'll know it's an Intel ad from its famous chimes. "I'm Lovin' It" is synonymous with McDonald's.

Deep Note, THX's distinctive audio logo often heard before movies, is getting an upgrade. The sound's creator, James A. Moorer, first composed it in code in 1982. RATH: Don't get excited.