After being named best new artist, the British singer won pop vocal album (In the Lonely Hour) and song of the year (a songwriter's award) and record of the year for "Stay with Me."
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Williams and Beyonce, both of whom had six nods as well, each won three awards. Williams also won best music video for "Happy" and urban contemporary album for Girl during the pre-show, while Beyonce snagged R&B song and R&B performance for "Drunk in Love," and surround sound album for her eponymous EP. She has now won 20 Grammys, surpassing Aretha Franklin for second most won by a female artist. (Alison Krauss leads with 27.)
Kendrick Lamar and Eminem split the rap categories, with the former winning rap performance and rap song for "i" and the latter taking rap/sung collaboration with Rihanna for "Monster" and rap album for The Marshall Mathers LP 2. Eminem has now won an unprecedented six best rap album Grammys.
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Other winners include Miranda Lambert (country album for Platinum), Carrie Underwood (country solo performance for "Something in the Water"), A Great Big World and Christina Aguilera (pop/duo group performance for "Say Something") and Joan Rivers, who won a posthumous spoken word album Grammy for Diary of a Mad Diva.
See the list of winners from the ceremony below. Click here to see the full list of winners.
Album of the Year: Beck, Morning Phase
Record of the Year: Sam Smith, "Stay with Me"
Song of the Year: Sam Smith, "Stay with Me," written by James Napier, William Phillips and Sam Smith
Best New Artist: Sam Smith
Best Pop Solo Performance: Pharrell Williams, "Happy"
Best Pop Vocal Album: Sam Smith, In the Lonely Hour
Best Rock Album: Beck, Morning Phase
Best R&B Performance: Beyonce feat. Jay Z, "Drunk in Love"
Best Country Album: Miranda Lambert, Platinum