VH1 sure was a turning point.
I've had a few personal musical turning points in my life but the most crucial one would probably be Creatures of the Night, by KISS. That was the first time I ventured outside of my parents record collection and discovered that there was a world out there, besides Elvis and the Beatles. Then I discovered VH and Ozzy and all those guys.
Funnily enough, I was listening to that KISS album yesterday, and my cat Googlie seemed to really like that CD. Don't know if she liked the music, but she sure liked the CD. :P
Otherwise, Diary of a Madman by Ozzy - the reason I play guitar, the reason I studied classical guitar, and still a huge influence.
But none of the would have happened without that KISS record.