Bob Hartman is a notable figure in the realm of Christian rock music and video productions, with a career that has left an indelible mark on physical media collectors. His work with the band Petra, particularly in the late '80s and early '90s, has resulted in a series of iconic releases that resonate with fans and collectors alike. Titles such as "Petra: On Fire Video Event" (1989) and "Petra: Beyond Belief Video Album" (1990) showcase not only the band’s electrifying performances but also the essence of contemporary Christian rock during that era. Collectors seek out Hartman’s films for their unique blend of music and visual storytelling, as well as their historical significance in the Christian genre. "Petra: Backstage Pass" (1992) and "Petra: Wake-Up Call" (1993) offer a glimpse behind the scenes, making them prized possessions for those who wish to own a piece of music history. With their limited releases and impactful content, Hartman’s works are cherished by both fans of Petra and physical media enthusiasts who appreciate the cultural narratives woven into these captivating videos.