The Box Music Network will sink up to $3 million in branding over the coming months, according to Greg Willis, The Box senior vice president of affiliate sales and marketing. "Music You Control" will be the theme of the network's effort to differentiate itself from competitors MTV, VH1 and MuchMusic. It will capitalize on The Box's customized video packages for different demographics, similar to a request line. "We put a computer file server in the headend of every cable system, so the brand is the same, but we are putting a different music mix, de