§ Improvise Polyphony in four voices

• The key idea is that we want to write four voices as 2+2 voices.
• Now, we are interested in "close imitation", where the second voice comes in shortly after the subject.
• There are two key factors: The pitch interval and the time interval.
• An example working close imitation is with pitch:4th, time:1.
• How to improvise polyphony in four voices according to Santa María