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When Adele performs at the Grammys on Sunday night, in front of an expected audience of 25 million, she knows that many will be expecting her voice to falter. After all, it was only four months ago that she underwent vocal cord surgery.

In November, he was the subject of a star-studded tribute at the CMA Awards show, and on Sunday night, he'll pick up a Lifetime Achievement trophy at the 54th annual Grammy Awards. Behind the scenes, it's been somewhat of a standoff between the CMAs

When Adele performs at the Grammys on Sunday night, in front of an expected audience of 25 million, she knows that many will be expecting her voice to falter. After all, it was only four months ago that she underwent vocal cord surgery.

By Kevork Djansezian, Getty Images file Whitney Houston and Clive Davis speak onstage at the 2011 Pre-GRAMMY Gala and Salute To Industry Icons Honoring David Geffen at the Beverly Hilton on Feb. 12, 2011. By Kevork Djansezian, Getty Images file Whitney

With the death of Whitney Houston just hours earlier, it's hard to focus on the matter of crowning the best in recorded music — but Sunday night's Grammy Awards are going to try.