Adagio in G Minor (Albinoni)
https://en.wikipedia.org/wiki/Adagio_in_G_minor
The Adagio in G minor for violin, strings and organ continuo, is a neo-Baroque composition popularly attributed to the 18th century Venetian master Tomaso Albinoni, but in fact composed almost entirely by the 20th century musicologist and Albinoni biographer Remo Giazotto.
Piece actually composed by Remo Giazotto based on Tomaso Albinoni's work.