Was the classical music that Mrs. Harrison played when she was escorting the carriage a piece by Einstein? What was his name?

The classical music that Mrs. Harrison played when she was escorting the carriage was not a piece by Einstein, but a piece by Mozarteum. The name of the piece was Requiem (K545), a religious music composed by Wolfgang Amadeus Wolfgang Amadeus in the 17th century to comfort the soul.