To add a video for Louis Glass / String Sextet, for 2 violins, 2 violas & 2 cellos, Op. 15, just enter the video‘s YouTube link:
example) https://www.youtube.com/watch?v=XXXXXXXXXXX
Search YouTube for Louis Glass / String Sextet, for 2 violins, 2 violas & 2 cellos, Op. 15