Propellerhead introduces the new Players in Reason 9 that change the way you make music.
In this tutorial Propellerhead walks through the fairly simple controls that make Scales & Chords work but then dive into the beautifully complex music you can make with it by building up a song together. If you think you might want Scales & Chords in your music, you should check this out.
For more info: propellerheads.se