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It was not explicitly mentioned what the slime was made of. They do however imply the slime was "brought to life" by Vigo and powered by the general bad vibes of the New Yorkers. You could take from this that the slime was either created by "ghost-power" or that the slime started from something very small and absorbed various elements from its environment. It was eventually established in Ghostbusters-The Video Game that the slime was manufactured by a contraption created by Ivo Shandor, the Gozer worshiper.
"(Your Love Keeps Lifting Me) Higher and Higher" written by Jackie Wilson. In the movie it is performed by Howard Huntsberry, though the Jackie Wilson original is heard during the dancing toaster scene.http://www.last.fm/music/Jackie+Wilson/_/(Your+Love+Keeps+Lifting+Me)+Higher+and+Higher
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