The Evil GM - Mood Music during play?

I was sitting down with a friend this weekend as he was planning his adventure for his game during the week and he was running plots by me to see if they sounded good or not so good. 

Then he looked at me and said, "Well what if we grab some cool music and play it on a small speaker to help set the mood for each new area they enter. So if they are in a tavern some nice tavern music can be playing in the background."

I said to him if that's what he wanted, go for it, but ask the players first, seeing how they feel. Then I explained to him that in the games I've played in, that had "mood music" I felt it was too distracting and gave me a headache. 

But I also said that was me, everyone has different feelings about the situation and its best to ask or say to the group, "I am going to try a little mood music and its too annoying distracting please let me know."

What you think about "Mood Music"?