Well, it may be anecdotal, but my kid watched LOTS of music videos when he was young. We found that when he was 9 months old, he'd sit in a chair and watch a music video (kids music video...Wee Sing,Sing-A-Longs, etc.) So needless to say, we took advantage of that fact. He grew up loving music, is a wonderful pianist, did very well in math, and is about to earn his college bachelor's degree at the age of 19. We didn't do TV per se...especially TV with commercials, but he did watch a lot of music videos and I believe it influenced him for the better. Was he drawn to the music videos because that was his aptitude, or was his aptitude developed because of the music videos? I don't have the answer to that, but I don't think TV/video viewing is all bad...I think some programs can be good.
My oldest son used to watch country music videos and learned to sing all the songs before he was two. Now that he’s 13, he refuses to sing, and want to be a heavy-metal drummer.