Xbox Director of Product Planning Albert Penello confirmed on Twitter that Xbox One owners who are Xbox Live Gold subscribers will have access to free Xbox music streaming supported with ads. This is similar to free music streaming on Windows 8 PCs and music.xbox.com. But this differs from Xbox 360, where users must hold an Xbox Live Gold subscription ($50/year) and an Xbox Music Pass ($10/month) to access the streaming service. We are not sure whether_there will be a limit for users to 10 hours of free music streaming per month after six months, and you can pay a monthly fee to get unlimited access. Source: Albert

The rest of the story...
Microsoft News