Boy Howdy! — the upcoming documentary about the irreverent former Detroit-based music magazine Creem — has a new trailer ahead of its premiere at the Freep Film Festival in April.In the clip, the likes of Metallica’s Kirk Hammett, the Black Keys’ Patrick Carney, and actor and musician Jeff Daniels discuss what was so great about "America's Only Rock 'n' Roll Magazine," or Detroit's answer to Rolling Stone.
"Buying Creem was a little bit like buying Playboy," Daniels says.…