Mejiro sells VHS taped explanations of main honkyoku in several volumes, each unfolding the techniques and expression behind two pieces. Played by Yokoyama (Living National Treasure & teacher of Kakizakai, Furuya, Riley Lee, etc.). Considering the technology, the tapes sound very good and reach back to an era that we cannot otherwise access. The two I bought include
Hifumi Hachigaeshi/Shingetsu and
Daha/Yamagoe.