Chris Willman Music WriterIt’ll be a New Year’s Countrified Eve on CBS this Dec. 31, as the network has just announced plans to fill the evening with no less than five hours of live country music performances from Nashville, now being plotted by a new production company put together by “CMA Awards” executive producer Robert Deaton and country artist manager Mary Hilliard Harrington.Titled “New Year’s Eve: Nashville’s Big Bash,” the show will air from 8-11 p.m.