According to the description, I would say it is this bug: Dynamic music is broken in combat sites
I guess this has to be fixed by ccp.
Reproducing is easy (for me):
* Check in the settings that dynamic music is used ("Override dynamic music with Classic EVE Music” is disabled)
* Warp to a combat site, zoom out, enjoy the broken music (A few milliseconds followed by several seconds of silence).
Imho make a bug report 