I’ve been having an interesting email exchange with a friend about the incidence of violin-cello works before the Brahms double concerto of 1887. David has rather grumpily conceded the point with the following observation: “I am not exactly in full retreat, but Vivaldi did, in fact, write 2 concerti for vn and vc. But 2 = 0 in his case.”
David’s point is about Vivaldi’s near-absurd prolificness. But I think his point may put him in the running for a Fields Medal.