An ascending or descending collection of pitches proceeding by a specified scheme of intervals. Scales usually start on one, go through two, three, four, five, six, and seven, then end on eight or one. There are major, minor, and chromatic scales.
This picture was taken by Caitlin. It is part of a chromatic scale.
For more information about scales, visit this site: http://www.geocities.com/SunsetStrip/Underground/2288/4scales.htm