A rehash is commonly used to refer to a remix of a song by another artist without much or any really change to the song itself. Seen a lot in pop, rap, techno music today, and very frequently with jazz and classical music in the earlier years.
Usually easily identifiable by the very similar, or exact-sounding lead, bass, or drum lines heard in a song.

Though, take care to remember that some DJ's and artists can very easily remix a song, that uses a lot of the same lyrics and lines as the original. But still add new beats, breaks, and a new feel to the song, and have the song be a legitimate remix.

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