I discovered this ...
www.thenationalanthems.com [212.100.237.198] - host alive, connection speed 23ms
Registrant:
Domains by Proxy, Inc.
15111 N Hayden Rd., Suite 160
PMB353
Scottsdale, Arizona 85260
United States
Registered through: GoDaddy.com
Domain Name: THENATIONALANTHEMS.COM
Created on: 02-Oct-00
Expires on: 02-Oct-06
Last Updated on: 25-Oct-04
So it was last updated on 25th October. Maybe the nationalanthems people that you found there before did not own the domain name, or did not renew it when it expired. There are plenty of companies trawling the web to grab domains where the registrant has no renewed. They jump in and sell, or more likely lease the domain to someone who is interested in that name. Here it seems that Domains by Proxy, Inc. have leased the domain to "TNA Hotels" a reservation agency.