The EGOT (Emmy, Grammy, Oscar, and Tony quadfecta) is the most prestigious badge of honor available to anyone in the performance industry (at least according to Tracy Jordan it is). There have been very few EGOT award winners since the history of time. The list includes Rita Moreno, Mel Brooks, Mike Nichols, and Whoopi Goldberg. Liza Minnelli and Barbra Streisand have asterisks next to their awards since they only received honorary Grammy and Tony Awards respectively.
Maybe I'm wrong to hold the Oscar in such high esteem. I mean, who's to say that one of the current Grammy darlings won't step up and be the next Cher? I can definitely see Taylor Swift heading in that direction based on her brilliant turn in the cinematic masterpiece Valentine's Day.