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The web site therandomscalemachine.com states the following, "The black and white buttons are representations of black and white keys on a keyboard." I saw that the webpage also stated " Click on a button to add that key to your selection list." They also said " A custom list of any number between 1 and 45 keys can be created. On selection the button will turn red. When satisfied with your selections, click the Lock button to lock the list. All selected buttons will turn to blue. The function is now ready to use." The meta header had scales as the first optimized keyword. This keyword is followed by random scales, random scale practice, and music scales which isn't as urgent as scales. The other words therandomscalemachine.com used was scales practice tool.