The movie below shows the distribution of Tar Heel Readers across the world from the start back in May 2008 until we passed 1,000,000 books read at about noon on March 3rd, 2010.
The pitch you hear reflects the rate that books were read day by day. Listen for the pitch to go down during the summer and at Christmas. The regular structure in the notes is caused by the drop in reading on the weekend. The pitch is too low to be heard near the beginning of the movie.
Congratulations to all you Tar Heel Readers who read all these books!2