I remember a specific Mozart Effect on my older son, who is very gifted intellectually (as is his younger brother):

When he was a roller (never crawled, just rolled around on the floor and went from rolling directly to walking) he was rolling around on the living room rug one day and the TV was going. Music is always playing during the commercials, and he took little note of any of it as he scooted around. However, during one commercial a snippet of Mozart (I think it was Eine Kleine Nachtmusik) came on, and he stopped dead in his tracks in front of the TV.

Just stopped and stared until the Mozart music ended, and then resumed rolling.