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Use Counterpoint exercise builder to learn composing counterpoint
It is recommended to start with 2 voices:
For each species:
After that move to 3 voices and 4 voices.
If you cannot use counterpoint exercise builder, here is a collection of cantus firmus that you can use to compose. Each cantus firmus can be used in any of species, keys and time signatures:
Learn how to compose a first species counterpoint:
Some known books about Counterpoint:
Please find examples in Examples section and in book above: Noel-Gallon / Bitsch Marcel - Traité de Contrepoint