and then we pointed out that johnny cash actually did a lot of work with rick reuben.ually -- >> not hip-hop, but okay. >> that extended his leg race. what do you mean by that? >> well, i think if johnny cash had died in 1990, he was pretty much a broken man career-wise. his record company can dropped him, country radio stopped playing him, his old fans forgetting about him. rick reuben, an unlikely hip-hop producer and says i want to make some music with you, john. john's first question was why? his biggest challenge was to get john to get his confidence back. june carter, his wife, said, "john, it's absurd you're going to work with this hip-hop producer. rts going to be an embarrassment." >> rick is so much more than a hip-hop producer. i want to go back to folsom prison. why did johnny cash go there? >> his career was teetering. in the '60s, he was making music mostly he wanted to make, meaningful music. that was not selling records. columbia records oh almost dropped him before "ring of fire" and he was still not the superstar he thought that he got this great resp