WHO The Stereotypes are Jonathan Yip, Ray Romulus, Jeremy Reeves and Ray Charles McCullough II (known as Charm).

WHY THEY MATTER This production and songwriting team, based in Los Angeles, barely kept its head above choppy industry waters for years before reconnecting with an early collaborator: Bruno Mars. The Stereotypes contributed to four of the funk and soul throwback singles from Mr. Mars’s 2016 album, “24K Magic,” including the multiplatinum title track; “That’s What I Like,” which hit No. 1 on the Billboard Hot 100; and “Finesse,” which shot to No. 3 this month, thanks to a remix with Cardi B. At the Grammy Awards on Sunday, the Stereotypes are up for three awards — producer of the year (nonclassical), song of the year and best R&B song (both for “That’s What I Like”) — while Mr. Mars is nominated for six trophies in all, including album of the year.