[1] From 1963 to 1969, Mayr worked with Pietro Grossi at "Fonologia Musicale's study" in Florence and received commissions from the musicological division of CNUCE/CNR.
He is a composer of the Florentine artistic movement that has been active since the end of World War II up to the present, including Sylvano Bussotti,[2] Giuseppe Chiari, Giancarlo Cardini, Sergio Maltagliati, Marcello Aitiani, Daniele Lombardi, Pietro Grossi.
These musicians have experimented with the interaction among sound, sign and vision, a synaesthetics of art derived from historical avant-gardes, from Wassily Kandinsky to futurism, to Alexander Scriabin and Arnold Schoenberg, all the way to Bauhaus.
In 1994, he was coordinator of the "Il Castello Del Tempo" meetings, organized by "Provincia di Firenze" at Pratolino-Villa Demidoff's park.
One of these was developed at musical research centre Tempo Reale, founded by Luciano Berio and directed by the colleague Francesco Giomi.