As of lately, it has been harder for me to focus fully on writing when music or a TV is on in the background. I don't know if it's old age or what. It's sad to think about but true, and it has proven itself. Many a time I've had a difficult time trying to focus while my other half has the TV on.
There are the odd times where I will listen to music stored in my computer while I am doing rewrites or edits or having writer's block. Sometimes it is good to hear some tunes when I am blocked.
I really wish I could listen to music and write like I used to. I like to think it's because I have matured in my writing to the point where I need to concentrate more.