Finally found this question after LOTS of scrolling through the 'music' section. As far as I know, the earliest use of a muted trumpet in a written score was way back in 1607 when Monteverdi, in his opera "L'Orfeo", inserted the instruction "E si fa un tuono piĆ¹ alto volendo sonar Ie trombe con Ie sordine", which means the trumpets will sound a whole tone higher due to the insertion of mutes (the invention of a mute that didn't change the pitch of the instrument was happen until nearly 200 years later). There are references to mutes going back to the early 16th century, but we don't know precisely what they were then or how they were used.
Mozart also used muted trumpets on occasion, such as in his Waisenhaus-Messe, K 47a.
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