Music Unlimited powered by Qriocity is Sony’s music streaming service available on PlaySation 3 in certain regions. The subscription-based service is now available for free for a six month period for all US PS3 owners over the age of 18.
This promotion coincides with the launch of music service for Android OS running on Sony Ericsson devices.
To gain access to your free trial, just check out the Qriocity application on your XMB.
Source: PS Blog