Design Cadence detector

[r0colita]

Proposition: There exists one or more sections inside a given piece where cadential formulae are present.

Chapter 11 of the Adler is exclusively dedicated to cadences, so it would help to go back from the modulation finder and find a function that detects the different kinds of cadence.

Algorithm should detect:

• The type of cadence at hand (Authentic, plagal, semicadance, deceptive, phrygian, exceptional).
• Whether a cadence is perfect or imperfect, suggesting the computer whether the piece continues or not.

[r0colita]

https://medium.com/@johnnyJK/data-structures-and-algorithms-907a63d691c1

[r0colita]

This function is not working with Piston's Example 11-1 because there is a neighbor note within the cadence. Might be best to learn how a music21.tree works to see if this can be taken into account.

There is a property called Horizontality.hasNeighborTone that can aid with this. But to get this property you need to do a process of making a music21.tree and extracting verticalities. It's very specific.