Sight-reading soprano part of Contrapunctus XIX by J. S. Bach (The Art of Fugue, BWV 1080)
This piece is from sight-reading master course week 4 day 1 by Vidas Pinkevicius. You can find it here
I recorded this video not from first time, because last line of first page is not printed completely. I tried to play a few times only first page.
I hope you like my sight-reading videos ;)