Time flies when you're having fun

Having fun yet?
Not so fast, Sparky.

Scientists with time on their hands suggest we pause for a moment.
We've all experienced the fact that time seems to fly when we're having fun. Or does it? What about when you're listening to a fantastic uplifting piece of music? Does time seem to fly by, or conversely, does it seem to slow down? When this was tested by Kellaris (1992), they found that when