To add a video for Johann Vierdanck / Sonata a 4 No. 27 (from Capricci, Canzoni & Sonaten), just enter the video‘s YouTube link:
example) https://www.youtube.com/watch?v=XXXXXXXXXXX
Search YouTube for Johann Vierdanck / Sonata a 4 No. 27 (from Capricci, Canzoni & Sonaten)