There is already a tipic about the Music City loading glitch. You can find it Here . Please be sure to check for other identical topics.
As for your question it is a glitch that has started recently, affecting many people and preventing them from acessing Music City. I do not believe there is a way to fix it yet but I'm sure that the staff of music city is working hard to fix this. In the meantime you can keep updated at the topic provided above.
Would a monidor please close this topic. Please and Thank you!