The Yale Whiffenpoofs, a college a cappella singing group, will give an encore performance at the University of Montevallo Jan. 7 at 7:30 p.m., in LeBaron Recital Hall. The free concert is open to the publicand is sponsored by the president&8217;s office at UM. The Whiffenpoofs maintain a performance schedule of more than 200 concerts annually, in addition to recording an album and embarking on a 17-week world tour. For more information, call 665-6230