Take in your breath (as in the recording) and hold it. There are only four instruments in this movement. First and second violins are responsible for the indifferent wheel of noise. Principal violin plays protracted sad and craving tune that's muted by viola, hung in the space, not going anywhere, just repeating its two knocks in every bar. These two notes are not evil, just completely detached and timeless.
Beyer and Gli Incogniti go crude here. There are really only four instruments, no real orchestra. In many other recordings, viola part is buried under the mass of violins, resulting in nice and boring music. However, Vivaldi wanted viola to be played very strong and ripped (molto forte e strappato), like a crying dog. Paralyzing.
Composer: Antonio Vivaldi
Work: Violin Concerto No 1, II. Largo
Recording: Amandine Beyer, Gli Incogniti