How do i find music sound tracks i hear on movies?

The way I find to be most effective is to search through the net (with Google for example) for "Movie OST" or "Movie soundtrack" and look at the results that I find. Often, you can find tracklists of the songs contained in a specific OST. Then you search for that on LW.
So, if I find that Movie A has Blues song A with Google, I search for that on LW (obviously)

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iMac G4 OSX 10.3.9
RAM 256MB
LW 4.10.5 Basic
ADSL anything from 3 to 8Mbps/around 1024kbps

"Raise your can of Beer on high
And seal your fate forever
Our best years have passed us by
The Golden Age Of Leather"
-Blue Öyster Cult-

I did wat u said murasame and did another search and still couldnt fid it. Im lookin for a song by Quiksilver, the messenger album. Can u help me find it ? Ty vm for ur Help my friend