The ScaleTwister enables you to transpose the 30 most important scales and chords in to all 12 keys. The Scales group include the most important pop, jazz and blues scales. The scales are grouped by three color circles that are associated with the MAJOR MINOR DOMINANT 7 scales. The Chord group enables you to determine chords. The Utility group will show you the circle of fifth and the corresponding degrees of the scale in each key, with this it will be easy for you to transpose and compose for different tuned instruments.