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In popular music, interpolation (also called a replayed sample) refers to using a melody—or portions of a melody (often with modified lyrics)—from a previously recorded song but re-recording the melody instead of directly sampling it.[1][2] Interpolation is often cited as a legal defence to mask unlicenced sampling when the artist or label who owns the recording of the music declines to license the sample, or if licensing the piece of music is considered too costly.
The 1983 song "Maniac" by Michael Sembello has been interpolated in "Maníaca" by the Spanish pop singer Abraham Mateo, giving him a gold record certification in Spain forty years after the original version of the Flashdance soundtrack also achieved a gold record certification (on October 15, 1983).
WhoSampled – a user-generated database of interpolations and samples in all types of music, as well as covers and remixes
[1] - delineation made by US copyright office between interpolation and sampling, namely that the former requires a license from the copyright holder while the latter requires a license from both the copyright holder and the recording artist