Jim in Tuscon writes: Hi Doc! I listened to your interview on BU today. You mentioned you have a course on teaching vocals. I’ve been unable to locate it on your site. Would you send me information regarding purchasing this product. This could save my marriage. 🤣 Thank you sir. Jim, Best I can guess, I was probably referencing “Learning to Sing in Tune“, a popular article on my site. Please note, the instructions are not to the student but to the teacher, and it’s about how to help...