One of my biggest pet peeves about blogging is music that plays when you visit a blog. It's always unexpected and it's very often loud. It's never something I want to hear and I have to hunt to find it and turn it off or fumble with my headphones or speaker. If that hunt takes longer than about 10 seconds, I will probably leave your blog without reading or commenting.
I've also noticed that there are lots of ads that play music as well. It's just as jarring and unexpected.
If you do have music on your blog, why? What is your reason?
If you don't have music on your blog, do you love it or hate it when you visit a blog that does?