To add a video for Johann Sommer / Der 8. Psalm (O Hoegster Gott) (from Die Fröhliche Sommerzeit, Tiel 1), just enter the video‘s YouTube link:
example) https://www.youtube.com/watch?v=XXXXXXXXXXX
Search YouTube for Johann Sommer / Der 8. Psalm (O Hoegster Gott) (from Die Fröhliche Sommerzeit, Tiel 1)