LOS ANGELES — The 57th annual Grammy Awards on Sunday were a mixture of old songs, new faces and upsets, as Sam Smith, a 22-year-old British singer barely known to American audiences a year ago, won three of the top four prizes, and Beck became the dark-horse victor of album of the year.

Mr. Smith took best new artist as well as both record and song of the year for “Stay With Me,” a moody, lovelorn ballad that became a smash on pop radio stations.

“I want to thank the man who this record is about,” Mr. Smith said when accepting the prize for record of the year. “Thank you so much for breaking my heart, ’cause you got me four Grammys.”

Besides those awards, Mr. Smith also won best vocal album, for “In the Lonely Hour,” one of last year’s biggest hits. The record of the year prize is for the recording of a single song, while song of the year is for songwriters.