A is for Audra, who awes and amazes. With each line and note, all the critics sing praises. And here's Audra McDonald in a beautiful white dress. She's being Lady Day at Emerson's Bar and Grill there. B is for Barbra, and Barbara too. Both versatile vocalists equaled by few. Here's Barbra Streisand, in Funny Girl. And this is Barbara Cook, as Marion the librarian from The Music Man.