Rosanne Cash was all in black yesterday, but not because it was the fave color of her dad, Johnny. The country songstress and 32 others dressed in mourning for a noon demonstration at Times Square, where they remembered the Virginia Tech tragedy by lying down for three minutes — the time it took Seung-Hui Cho to kill 32 students and himself. The demo, attended by Mayor Bloomberg, was organized by protest site easyguns.com, a grass-roots group started by Washington Philharmonic cellist Abby Spangler.
Roseanne Cash is not on the list.
But she ought to be.