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Your MBP is expressing its interest in being a techno artist. ;)

It's likely that your fans are dusty or the bearings are shot. You will need to get the machine looked at quickly or the fans could fail, causing your computer to overheat.

Use this guide to open it up and take a look (assuming you have a Core 2 Duo processor model).
 
I can't tell if it's a fan. Does it ever stop? Do you have a CD burner in that thing?
 
Forget getting it fixed, you need an exorcist!

As others have stated, it's a mechanical failure (perhaps the fan) and needs to get fixed asap.
 
it usually doesn't start up right away. maybe about 5-10 minutes after turning it on. i guess i'll be heading over to the apple store today...
 
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