Since I might be listening to some music and then load up a flash page and booom this massive sound/music untill the page loads where you can then turn it off.
Yeah I know just wanted to make it clear what kind of flash I am talking about here.
Well, I recommend using flash blocker (link) so that if you do come across flash it doesn't just auto-load - it loads when you want to. I generally don't listen to the music in the flash games only in vids as the sound is not that great.