Is there any equipment to prevent external sound in an office environment?

Question

My office have worldspace on speakers. I like music very much and my concentration is only on music not in my work.

Answer 1

Brilliant question! You dont wanna concentrate on your job? Quit and let someone have it that will!

Answer 2

The best thing you could do is to get some earplugs. Good ones can be found at stores that sell guns.