/* Servers and groups */
SELECT DISTINCT groups.name AS 'Server Group Name'
     ,svr.server_name AS 'Server Name'
FROM msdb.dbo.sysmanagement_shared_server_groups_internal groups 
INNER JOIN msdb.dbo.sysmanagement_shared_registered_servers_internal svr
 ON groups.server_group_id = svr.server_group_id;
GO