This skill will help you practice your scales and chords by asking you to play randomly chosen scales, chords and keys. Prompt Alexa for a scale chosen at random with "Alexa, ask random scale", prompt her for a random key with "Alexa, ask random scale for a key" or prompt her for a chord with "Alexa, ask random scale for any chord". (Better to say "any chord" than "a chord" as Alexa confuses the latter with "accord".)
You can be more specific by asking for chord and scale types. For example "Alexa, ask random scale for a pentatonic scale" or "Alexa, ask random scale for a seventh chord".
If you are not specific about the type of scale ("Alexa, ask random scale") Alexa will pick from the major, natural minor and blues scales, selecting a key at random. If you specify a type of scale then more possibilities are available. For example if you ask for a minor scale, Alexa will pick from the natural, harmonic and melodic minor scales.