How can you concéntrate more with music or w/o music

It really depends on the person. for example I concentrate better while listening to music. I suggest you test the theory and find out if your the same way. You might not be.

Well for some people it is different. some people can concentrate better because it is soothing and they focus more. They can block everything else out. Some people though get very distracted. They don't focus on what they need to they focus on the music. So it all kinda depends on the person.