Maj7th chords
https://www.youtube.com/watch?v=tF0oD5wmvdM&list=PLE2hTx-JzAGF3ZYVtAJeE4waXpKMJAF0z
7th chords
https://www.youtube.com/watch?v=MJRuKsJJwTc&list=PLE2hTx-JzAGEsytWeUS8cOGgxjKE63H-h
m7th chords
https://www.youtube.com/watch?v=_9JZ15GknhY&list=PLE2hTx-JzAGE-4Z9x_5Q9N9Gu0CzwPEON
