We've used the second option (SKrafty/whenyouriseup) for three self-paced classes (elementary school level). It's a fun, helpful community. Server/chat is monitored very well. Has an active Facebook group, and the admins are quick to address and resolve any issues/conflicts that do pop up. I've been very impressed so far (it's been about 3 months since we joined).
When I went off to college, my flute teacher bought me a Sunbeam Hot Shot hot water dispenser for my dorm room. That was 18 years ago; I've used it a least a few times a week ever since! It's perfect for what you're describing. They're around $15, I think.
DD just joined Girl Scouts as an individual member/Juliette. She's a Daisy; right now she's learning the Girl Scout Law and working on her light blue "honest and fair" petal. We're planning to learn more about Juliette Gordon Low the last week of this month, and we'll finish up with a little celebration in honor of Low's birthday Oct. 31.
Seconding Moses Hogan!!! Love! Duke Ellington and Scott Joplin, as already mentioned. William Grant Still would be a good, too. Maybe even Blind Tom? (blindtom.org has a ton of info and resources, even sheet music)
We're doing Italian since I already know it. I keep it laidback and play-based. DD just started rolling her R's, so she's super excited about speaking now! :)