To add a video for Johann Sebastian Bach / Prelude and Fugue, for keyboard No. 1 in C major (WTC II/1), BWV 870, just enter the video‘s YouTube link:
example) https://www.youtube.com/watch?v=XXXXXXXXXXX
Search YouTube for Johann Sebastian Bach / Prelude and Fugue, for keyboard No. 1 in C major (WTC II/1), BWV 870