To add a video for Peteris Vasks / Lūgšana Latvijai (Prayer for Latvia) (arr. by Vilnis Smidbergs), just enter the video‘s YouTube link:
example) https://www.youtube.com/watch?v=XXXXXXXXXXX
Search YouTube for Peteris Vasks / Lūgšana Latvijai (Prayer for Latvia) (arr. by Vilnis Smidbergs)