Heavy meta-san is a variety show featuring Megadeth's former guitarist, Marty Friedman. They discuss Rock & Roll and Metal music, as well as play a few games. There's not too much discussion, so it's very non-Japanese-speaker friendly. It also features Kumada Yoko, and some not-so-significant guy (lol). Of course, there's a part where Marty plays traditional Japanese tunes on his guitar, adding metal riffs to em.
I posted an ep in
The Asshole. This one had Yashiro Aki, who's an enka singer. It's interesting to watch, and of course, don't miss the awesome medley they perform. Enka singing and metal aren't that incompatible after all, lol.