This is a replacement file for the music played durring the loading of the game. I thought it sounded kind of fun and heroic. It is 
the theme from Airwolf and was sequenced by Neil Strawbridge in Midi then converted to Wav format on Winamp. To instal this replacement music for the loading screen of your game, open the file that contains The Sims, then open the music file, open the file named modes, open the file named load, copy the file named loadloop and save it somewhere else where you can find it later (you need the original if you should ever want to restore it), then return to the load file and replace the original loadloop with this new one.
Assuming that you have The Sims in the default file on your C drive, you would place Loadloop in this file:
C:\Program Files\Maxis\The Sims\Music\Modes\Load