 In the first of a two-part interview (the second part appears on 20/20 Downtown) Liza Minnelli talks to Cynthia McFadden about her new Palace Theatre stage show "Minnelli on Minnelli," a tribute to her film director father Vincente Minnelli; Diane Sawyer talks to Billy Bean, former pro baseball player who recently came out of the closet, and his partner Efrain Veiga.