How to isolate a refrigerator?

My kitchen and a refrigerator are above the basement, where my listening room is, and the noise from the fridge's motor is transmitted through the walls and the ceiling.
Any ideas, how to isolate the fridge from the floor?
in terms of upgrades, if you can't fix the problem with isolation (like feet or cork), buying a quieter fridge is pretty cheap - you might even find one for free on Craigslist. I have a 7 or 8 y.o. kenmore that's extremely quiet - the neighbors gave it away when they remodeled their kitchen - and it's much quieter than my previous one.
I did a search on the most quiet Fridge around and this name continually pops up every time. Might be the best upgrade you ever made...

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it's true that you can spend megabucks on super-quiet (always European) fridges, but recent vintage, energy-efficient domestic ones can be quiet enough (+ cheap) to fix your problem.
I used to turn my fridge off for "critical" listening (it's in the same "great room"), but I kept forgetting to turn it back on.

@Miltcharlie: Thanks for the timer idea.

Actually my Hotpoint fridge is not too bad for noise. I think it was original equipment that came with the condo in '93 or so.
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