Yeah, that's what they are magnetic impulse bombs.For info just write in (E-bombs by Jim Wilson)in your search engine.
I wonder if a magnitron tube out of a microwave would work on the music :-)
I know they work on digital watches and beepers, but don't know their range.
When I lived in Wilmington, DE I dreamed of owning an EMP device which would disable the rolling boomboxes driven by the neighborhood's little wannabe gangstas. They would come down the street at 2am with their car stereos rattling the windows all down the block. I could just hear them:
"Yo, dog! Somp'n done happen to my thang, cuz."