The Berklee free on-line courses are worth several hundred dollars each, in my opinion. And they cost nothing.

I will check this one out after February.

Meanwhile, one of the folks that participates in the February Album Writing Month challenge has a blog with 'Tickets to Write', with interesting observations about chord structure/patterns common in Beatles songs. I've used them more than once to get out of typical chord pattern ruts.

http://beatlessongwriting.blogspot.com/p/tickets-to-write.html

-Scott