Sorry for the double post, but here is a follow up.
I figured out how to get SWYH as a Music Source on the 360 but it won’t successfully connect.
By restarting the application, and NOT choosing any Stream To devices, it is listed as a music source – Stream What You Hear (LEVISLAPTOP), however when I selected this source it says: Connecting to your PC. Please wait.
And after a few moments it says: Unable to connect to the computer. A firewall may be blocking the connection.