The Huffington Post has a blog by Sophia Jones, “’SNL’ Has Nothing On the Way The Middle East Mocks ISIS”. See http://www.huffingtonpost.com/2015/03/03/mocking-islamic-state_n_6790254.html. Many of the YouTube videos use the music from ISIS videos to mock ISIS.
Oh, yes, many are not anonymous. The poster’s name and picture accompany the YouTube snippet.
See also “Muslims do speak out. Are you listening?”