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@JeffK It seems to me that you’re referring to the Skills courses, and not the daily lessons, correct? I know some new ones wee added in the past 2-3 years. Those are the foundational skills that probably cover a lot of what you’ll need outside of the daily challenges that teach scales, functional skills etc., and yes repetition and becoming better with each go around of the dailies leads to improvement. Have you tried the old TAC Song Vault. That might give you some added challenges. It’s not included in the current TAC, and it was put on a more public site for those that originally paid for it, but it is often shared with everyone now,
https://hub-lkx8655w8n.membership.io/