Dear Mr. Zentgraf, I came across your Cello Academy lessons on youtube. As an adult beginner, I have not come across anything as helpful as your lessons, and am grateful to God for discovering your excellent teachings at just the right time. I feel I am progressing in ways I have not since I started cello, thanks to your superbly clear and practical approach. Your very respectful approach is so appreciated, just wanted to say thank you, thank you!