KC Music, a full-service music store, will hold its grand opening from noon to 6 p.m. Saturday at 6506 N.W. Prairie View Road in Kansas City North—along with a scheduled appearance by rock legend Todd Rundgren. The event will include prizes, giveaways, a silent charity auction and the appearance from Rundgren, who will perform as a member of Ringo Starr’s All-Star Band that evening at Starlight Theatre. (The exact time…