Determine the melody key

[oggy22]

Given a melody determine the key of the melody. Key is the pair of the note and either major or minor, for example C major or e minor. Alternatively minor can include scale such as melodic, harmonic or natural.

[oggy22]

Algorithm draft:

• Make a toneset of all the melody tones
• Determine what major/minor scale is superset of the toneset. Possibly include harmonic and melodic. If there is none, try with removing some notes from the tonset.
• If there is one candidate, determine if it's major or paralel minor by examining key notes.
• If there are more candidates, there are 2x key candidates.

[oggy22]

Duplicate of #54