To add a video for George Onslow / Sextet for piano, 2 violins, viola, cello & double bass in E flat major, Op. 30, just enter the video‘s YouTube link:
example) https://www.youtube.com/watch?v=XXXXXXXXXXX
Search YouTube for George Onslow / Sextet for piano, 2 violins, viola, cello & double bass in E flat major, Op. 30