Do you want to use some music for a video clip or some classroom activity, but you want to avoid using a recognizable piece? Why don't you try "
WolframTones". According to the site, "
WolframTones works by
taking simple programs from Wolfram's computational universe, and
using music theory and Mathematica algorithms to render them as
music." Sometimes a tune will sound familiar, but rest assured that each tune is unique. You can adjust most of the parameters: tempo, key, mode, genre. Make it your own!