Although it might be fun to listen to, freestyling is anything but easy. After all, it's an art form that takes skill, drive and razor-sharp reflexes -- and, usually, plenty of practice. In this all-star documentary, some of the most talented MCs in the business (including KRS-One, MC Lyte, Jay-Z and Kanye West) reveal tips for success, from the basics of how to hold a mic and make a demo to performing live and getting signed.