MEDIA EXPLOITATIONS by Richard Robinson Creator and Founder of ROCK SCENE Magazine (March 1973)  We spent a lot of time sitting around the office this week trying to come up with a descriptive slogan to explain what we're planning to do with Rock Scene as a magazine.  Eventually we came to the conclusion that Rock Scene was "the alternative to the alternatives".  Not the kind of slogan you might want to go around humming, but pretty much dead center for those of us…