Trattado de Glosas

This treatise is part of many in the 16th century, which show you how to apply ornaments to a given melody by giving tiny snippets of melody without ornaments, and then examples of ornaments you could apply to these unornamented melodies in a table-format.

But, Ortiz also shows other improvisation techniques, like improvising over a tenor, improvising in several parts, adding a 5th part to a 4 part piece and more.

A translation is available here:

https://www.baerenreiter.com/en/shop/product/details/BVK1594/

Book 1 starts of with ways to ornament certain cadences and intervals.

Cadences first:

Then the intervals follow. For example one note up and then these examples follow: