The Circle of Life… almost but not really. The circle of Fifths.
“The circle of fifths is a sequence of pitches or key tonalities, represented as a circle, in which the next pitch is found seven semitones higher than the last. Musicians and composers use the circle of fifths to understand and describe the musical relationships among some selection of those pitches. The circle’s design is helpful in composing and harmonizing melodies, building chords, and moving to different keys within a composition.”
The following video is about nine minutes of fabulous circle progressions from the Baroque and Classical music eras.
 Wikipedia contributors, “Circle of fifths,” Wikipedia, The Free Encyclopedia, http://en.wikipedia.org/w/index.php?title=Circle_of_fifths&oldid=523003386 (accessed November 15, 2012).