Songstress Martina McBride and all-around music great Jim Brickman are scheduled to perform the new country single, "Valentine,", which was a pop hit last year, on Sunday's ABC-TV taping of A Gala For The President At Ford's Theater. The event, hosted by Whoopi Goldberg, will also feature other such celebrities as David Copperfield, John Fogerty, gospel artist Kirk Franklin and comedian Anthony Clark. The special is slated to air later this year.