nexus is great if you treat it like a giant sampler. If you need a popular "stock" sound its perfect. if you want to make an origianl piece then im afraid you need something like reactor fm8 massive etc etc
Processing a highly structured and complex pattern of sensory input as a unified percept of "music" is probably one of the most elaborate features of the human brain.....understanding how music is perceived and how it may elicit intense sensations is far from being understood.