Thanks, Rolo!
Unfortunately I can understand only half of it - is he saying that rock music itself is a museum case, or just his own music?
I'm Portuguese and I barely understand anything. It's a terribly written piece, with several mistakes (Mandela show was in 1988, not 1985) and no structure at all. I couldn't even figure out what questions they were asking him.
I also found it funny that the interviewer says he didn't directly answer any of the questions and said that he "lacks focus".
But to answer your question, the "journalist" opens the article by saying that Mark thinks he should be in a museum because he doesn't see any more guitarists like him coming through.