MSN Music Cancellation
Any charges you incur with the MSN Music service are viewable by clicking 'About this Service' on the MSN Music line under the 'Services' column on the My Microsoft Billing Account page.  On the Service Details page for MSN Music, click 'View Service Activity'.

MSN Music service is a transactional or a la carte service, meaning you only pay for the items you agreed to purchase. MSN Music is not a subscription service and there is no reoccurring fee for using MSN Music.