How to list LOGIN + ROLE in SQL Server 2008?

I'm looking for an answer but i can't found. Just a lot of long scripts.

I need to list Login | Role ( sysadmin, dbcreator, etc ) but i can't find a table to join.

I have this for now:

SELECT name AS Login_Name, type_desc AS Account_Type
FROM sys.server_principals 
WHERE TYPE IN ('U', 'S', 'G')
and name not like '%##%'
ORDER BY name, type_desc

I need another collum with the Role.

With table should I search for it?

Thanks.