Often, artists and labels will have had a website live at a certain domain, only to take it offline at a later point. In many cases, I've found that these websites are a source of valuable information on the subject matter and their releases. These websites could then be browsed with historical web-crawlers, such as Internet Archive Wayback Machine [1].

As such, I'd like to request the ability to add defunct websites/webpages by denoting them with a Boolean checkbox.

For example:
http://web.archive.org/web/20060507165828/http://www.thewarpathhc.com/
http://web.archive.org/web/20090105182748/http://www.actionmanrecords.com/hardcorecinema.html

Perhaps these links could be displayed at the bottom of the appropriate relationships page, maybe even with an extra link to view them with Wayback Machine.

[1] http://wayback.archive.org/web/