To add a video for Giovanni Battista Fontana / Sonata No. 15a for violin (or cornetto) & basso continuo (from Sonate à 1, 2, 3...), just enter the video‘s YouTube link:
example) https://www.youtube.com/watch?v=XXXXXXXXXXX
Search YouTube for Giovanni Battista Fontana / Sonata No. 15a for violin (or cornetto) & basso continuo (from Sonate à 1, 2, 3...)