I am currently putting together a porfolio of short films and videos that I can submit to production companies and record companies. Quick question: even if I use copyrighted music for films that won't be screened at a festival, only for producers, agents, etc. do I still need to go through the whole begging process of getting a musician to allow me to use their work. It may sound like a stupid question, but I'd rather know now than regret it heavily later.