An excellent video lesson from NY trumpeter Charlie Porter on how to approach learning to improvise. Music is a language and when learning to “speak” music, take the same approach you used when you learned to speak language. As Clark Terry said, “Imitate, assimilate, innovate.”
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The Practice of Practice 
I found your video on improvization very enjoyable and helpful.
very awesome….love the approach and I amsure your students are very successful because of this approach