I've had some prior exposure and been going through DuoLingo German. Being mostly done, I'm at a low B1 proficiency in a year. It is quite an astounding piece

I've had some prior exposure and been going through DuoLingo German. Being mostly done, I'm at a low B1 proficiency in a year. It is quite an astounding piece of learning software, overall. They have a music module that I've tinkered with a bit, but a phone is no substitute for a piano. Haven't looked at the math stuff.