A song that is labeled as "Nightcore" is a techno/trance/dance song that has been modified from an original song - it differs from that song in that its tempo and pitch has been raised. These levels are usually around 20-30%, and are raised simultaneously. Please note that a song need not be anything more than a speed increase in order for it to qualify as a "Nightcore" song.
A coined term for Nightcore is that it is a raise of speed and pitch. Although this is commonly used, it is not correct, since the very definition of "speed" is a combination of both tempo and pitch. Therefore, "Nightcore" can be seen as a glorified term for "speed edits" of techno/trance/dance songs.
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