When John Lennon penned the lyrics to "Help!" on a small piece of paper, he probably didn't think that generations later, people would frame it in a glass case and send it across America on a 12-city tour. But neither did Buddy Holly probably think his wallet with its business cards, family pictures and handwritten notes would be considered collectable or making the same tour along with Freddy Mercury, Janice Joplin or Dimebag Darrell. But these items are just some of the many iconic memorabilia that fans can view at "Treasures of the Hard Rock," a music memorabilia exhibit that opens this week at the Hard Rock Cafe in Dallas.