It's safe to say that the line between mixtapes and albums has never been blurrier, and as a result, more and more rappers and singers are releasing retail projects that continue tangents that began with free releases. With both French Monatana's MC4 and Juicy J's Rubba Band Business: The Album on the horizon, we're looking at a few of the tapes that have eventually gone on to inspire albums. Take a look through our gallery to see, and let us know what your favorite album or mixtape from the list is. Has this trend inspired good work from artists?