Error message

Deprecated function: The each() function is deprecated. This message will be suppressed on further calls in _menu_load_objects() (line 569 of /home/digalato/public_html/includes/menu.inc).

Can I just submit a music-video url instead of a comment?

Kindof. Although the comment cannot be blank, you can enter something like 'Check out this video', or 'This song really made me feel better', or whatever.