Johann_Gottfried_Müthel

Johann Gottfried Müthel (January 17, 1728 – July 14, 1788) was a German composer and noted keyboard virtuoso. Along with C.P.E. Bach, he represented the Sturm und Drang style of composition.
As far as is known, he was the first to use the term fortepiano in a published work, in the title of his Duetto für 2 Clavier, 2 Flügel, oder 2 Fortepiano (1771), which reflects the rising popularity of the instrument at that time.