Interpolation

[Sarah]

n. The way that a good majority of mainstream [hip-hop] songs get their melodies. Technically, it's a form of [sampling]; an interpolation is basically borrowing (or stealing) the melody of another song and recording it as your own. In theory, it's supposed to be done legally, although there have been cases of artists reusing melodies without permission, which have led to [lawsuit]s.

[Renato]

The insertion of something of a different nature into something else.

[Justin Bieber]

In the mathematical field of numerical analysis, [interpolation] is a method of constructing new data points within the range of a discrete set of known data points. In engineering and science, one often has a number of data points, obtained by sampling or experimentation, which represent the values of a function for a limited number of values of an independent variable. It is often required to [interpolate] (i.e., estimate) the value of that function for an intermediate value of [the independent variable].

[Tina]

the addition of something different in the middle of a text, piece of music, etc. or the thing that is added: