Realy thanks Alberto Maracheski for videos.
His channel: https://www.youtube.com/channel/UC1GcvwDA0f01J0M1Llc7zsQ
Lowest Note by thebassmanadam (G -4) : https://www.youtube.com/watch?v=eKYqgU1e_80&list=UUq5u0V3YhJa6UQXdi5zw8Ew
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