This video basically sums up the shortcomings of the music app on windows phone 8.1 dev preview. I believe that the xbox music app is the same that's coming ...
Problems & Issues with Windows Phone
Windows 8 Netflix App Problems and Solutions
Top 5 ISSUES with Windows Phone 8.1
Whatsapp Performance On Windows Phone 8 - Fonetick
No Sound? Here's The Solution! Windows XP
Read more about The Geek Mind.