oh come on, 90% of what's on the site now is in clear violation of the TOS I quoted. or are you suggesting that, for example, user 'Descending' owns the rights to 'Help' from the Beatles ?
how do you explain these rules in regard to this :
YouTab also requires that the music videos that you attach to your tablature shall be your own or videos which you are licensed to display; for example, you are not allowed to embed an unlicensed Metallica video and write down your tabs for that song.
true, you have covered yourself by stating these things in your TOS, but after removing all videos that are not in accordance, you're left with an empty site.
seriously, from a technical point of view I love projects like these, but I cannot see how this could ever work in the long run if it's dependent on youtube. at least not as long as large record companies exist and enforce their copyrights as they tend to do.