With those words, MTV launched 12:01 a.m. on August 1, 1981. And love it, hate it, or just don't think about it much at all (and, personally, I've gone across that entire spectrum these past 30 years), you cannot deny that it changed the landscapes of, yes, music and television, forever.
I'll let history determine whether or not that's a good thing.
Anyway, some enterprising interwebber put the entire first hour of MTV programming - commercials, station promos, mis-ordered VJ introductions and all - up on YouTube. Please to enjoy. I know I will.