Information from <<https://my.strathspey.org/dd/issue/3304/|issue 3304>>:  
Music printer, publisher and seller of prints, musical instrument maker.
Traded alone from c. 1774-89, as John Preston and Son from c. 1789-98, as Thomas Preston c. 1798-1834.
Purchased stock and plates of Robert Bremner 1789.
Son Thomas was partner and successor, purchased stock of various firms.