loops are the build of a track...You should listen to other tracks of the same genre,listen how they build up, talk yourself through what is happening with the bassline,listen for the Hihats coming in at points to build up the tempo of the track,listen to how they use effects to change from one part to another for example Backwards Reverb effects,also listen how they use cutoff to build up to high points or come down into a Break.Try to pick out the different parts of the track (Pull the track apart in your head while listening to it) think what you yourself maybe would have done different if it was your own track....
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Here is a scan from one of me books "Recording and Production Techniques" by Paul White. ISBN 1-86074-443-5
http://www.amazon.com/gp/product/186...30439?n=283155
(Sorry about the pen,i just love defacing me books
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Hope this helps