  In this paper, we consider the MUltiple SIgnal Classification (MUSIC)
algorithm for identifying the locations of small electromagnetic
inhomogeneities surrounded by random scatterers. For this purpose, we
rigorously analyze the structure of MUSIC-type imaging function by establishing
a relationship with zero-order Bessel function of the first kind. This
relationship shows certain properties of the MUSIC algorithm, explains some
unexplained phenomena, and provides a method for improvements.
