Thanks for the clarifications folks, I'm beginning to understand how things are packaged. So just to broaden the inquiry a little bit:
My primary interest is Celtic music. If I buy the following, will I have crafted for myself an "Everything Celtic" package of RealTracks/Styles at a lower cost than one of the other more robust general paks?

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Win8.1 64bit, Intel I7 4700MQ, 8GB ram, 1TB HD, Studio One Artist, Melodyne Essential, Musescore