Although collaborators of Childish Gambino say they are not sure where he is on the evening of the Grammy.
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Gambino won four trophies on Sunday, but the rapper, whose real name was Donald Glover,
"This Is America" won the record and song of year awards, two of the three largest categories.
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Co-producer Ludwig Goransson told him that he tried to call Gambino after the show but it did not go through. Riley said he would try again.
Riley Mackin, an engineer-mixer in the song, said he had seen Gambino late when they worked in the studio a few days ago.
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Asked if Gambino's loss was unique, Mackin said, "Everything Donald does is different."