"Before the fire to pass peaceful, Contented days while the rain outside pours down."- from the sonnet which accompanies the concerto.
Two very different performances of the Largo, a Grade 5 piece. A free edition of the concerto is available from the Mutopia Project.
The first is a conventional performance on modern instruments, by Itzhak Perlman, followed by Fabio Biondi on a baroque violin interpreting the piece in a unique way.
EDIT: Well, that's a shame, the second video's disappeared due to complaints about copyright. So here's the same group playing and discussing other music by Vivaldi: