Bm
This is an arrangement for string quartet of J. S. Bach's final prelude (BWV 869) from Book 1 of the "48" (The Well-Tempered Clavier). Louis Andriessen's arrangement includes a viola part that starts with six bars by Igor Stravinsky, taken from Stravinsky's own arrangement for strings.
Parts only. The score is available from The Shop at Boosey.com.