There are lectures from one of Yale's Music Theory classes on YouTube here: https://www.youtube.com/playlist?list=PL9LXrs9vCXK56qtyK4qcqwHrbf0em_81r https://www

There are lectures from one of Yale's Music Theory classes on YouTube here: https://www.youtube.com/playlist?list=PL9LXrs9vCXK56qtyK4qcqwHrbf0em_81r https://www.youtube.com/playlist?list=PL9LXrs9vCXK56qtyK4qcq... There's a Kindle version of the textbook on Amazon.