ASP Cookies offered by the site indicate that the Linux machine has probably been inserted as a reverse proxy in front of the existing Windows servers as part of an attempt to improve site availability.
% telnet www.riaa.com http
HEAD / HTTP/1.1
Host: www.riaa.com
200 OK
Cache-Control: private
Connection: keep-alive
Date: Wed, 24 Mar 2004 17:06:46 GMT
Accept-Ranges: none
Server: TST-SECURE-OS
Content-Length: 15036
Content-Type: text/html
Expires: Wed, 24 Mar 2004 17:06:46 GMT
Client-Date: Wed, 24 Mar 2004 17:06:36 GMT
Client-Peer: 146.82.174.10:80
Client-Response-Num: 1
Set-Cookie: ASPSESSIONIDACCAQQTA=JFDOPGDADGIMCADEOPMCBFCI; path=/
Set-Cookie: tstid=1e1bcc1010b6de32734c584317443b31.00.2618aad9df7cdf5ccc840a9df9a5275f;
domain=.riaa.com; path=/
Set-Cookie: tstid_wat_.riaa.com=
ASPSESSIONIDACCAQQTA=ec9f3581e5a946cc2f1de6fb0600d9c1; domain=.riaa.com; path=/