LOS ANGELES (Reuters) - When veteran rock band Journey chose unknown Filipino singer Arnel Pineda to become their new frontman it inspired a filmmaker to capture his rise from obscurity in the streets of Manila to performing on arena stages. "Don't Stop Believin': Everyman's Journey," directed by Filipino-American filmmaker Ramona Diaz, picks up Pineda's story soon after he was chosen to join Journey in 2007 after the group saw him on YouTube. Diaz's documentary film opens in theaters on Friday. She spoke to Reuters about Pineda's story and working with the band. ...