Nobody can hear the hold music any more because the vocoders are voodoo and the mobile networks drop 99% of the packets. Only people on landlines and VoIP have any idea what your hold music even is. On mobile it's just undifferentiated screeching.
> On mobile it's just undifferentiated screeching.
Maybe the caller was a Norwegian death metal fan? ;-)
"What's that awesome track you were just playing? I tried Shazaming it, but it just came back with Beyonce. I can't find a death metal band covering any of her songs?"