We used to have a lot of music shows over here, old grey whistle test, top of the pops, the tube, ready steady go amongst others.
Oddly we use to have a couple metal shows that were on MTV (I think) that were decent.......Headbangers Ball and That Metal Show. Of course, there have been numerous Docu-series and specials such as "I Like the 80's" and Metal Evolution. But as far as a GOOD rock TV talk show, I can't think of any.